Data File Types
Data files are the most common type of computer files. They may be installed with applications or created by users. Most data files are saved in a binary format, though some store data as plain text. Examples of data files include libraries, project files, and saved documents.
NOTE: The Data Files category encompasses other more specific categories. File types that do not fit within these subcategories are placed in this category.
Common data file extensions include .DAT, .XML, and .VCF.
| Extension | File Description | Popularity |
|---|---|---|
| .1pe | TurboTax Form File | Rare |
| .1ph | TurboTax File | Rare |
| .3dr | 3DMark Results File | Common |
| .3dr | 3D Rad Project File | Average |
| .3dt | 3D Topicscape File | Average |
| .3me | TurboTax Form File | Uncommon |
| .3pe | TurboTax 2008 Form File | Uncommon |
| .4dv | 4D View Ultrasound File | Average |
| .8xg | TI-83/84 Plus Group File | Uncommon |
| .8xk | TI-83 Plus Application Upgrade File | Uncommon |
| .8xs | TI-83/84 Plus String File | Rare |
| .8xv | TI-83/84 Plus Variable File | Uncommon |
| .a3l | Authorware 3 Library | Rare |
| .a3m | Authorware 3 Macintosh File | Rare |
| .a3w | Authorware 3 Windows File | Rare |
| .a4l | Authorware 4 Library | Rare |
| .a4m | Authorware 4 Macintosh File | Rare |
| .a4w | Authorware 4 Windows File | Rare |
| .a5l | Authorware 5 Library | Uncommon |
| .a5w | Authorware 5 Windows File | Uncommon |
| .a65 | Authorware 6.5 File | Uncommon |
| .aam | Authorware Map File | Average |
| .aao | Agenda At Once File | Uncommon |
| .ab | DNA Sequence File | Rare |
| .ab1 | DNA Electropherogram File | Average |
| .ab2 | Print Shop Address Book File | Uncommon |
| .ab3 | PhotoImpact 3 Album File | Average |
| .abcd | AudioVisual Book Data File | Average |
| .abdata | Adobe Bridge Data File | Uncommon |
| .abi | DNA Chromatogram File | Average |
| .abkprj | Ashampoo Backup Project | Average |
| .abp | AVS Barcode Profile | Average |
| .aby | AOL Address Book File | Average |
| .aca | Agent Character Animation File | Uncommon |
| .acc | Graphics Accounts Data File | Average |
| .acf | Agent Character Data File | Uncommon |
| .acg | Agent Preview File | Uncommon |
| .adt | ACT! Document Template | Common |
| .adu | Addict User Dictionary File | Uncommon |
| .adx | Approach Index File | Average |
| .afe | Avid File Exchange File | Uncommon |
| .aft | Ancestry.com Family Tree Database | Average |
| .agd | AgileGraph Data File | Uncommon |
| .aggr | Adobe Captivate Aggregate File | Average |
| .aifb | AIF Builder Project File | Average |
| .aiv | AIVault Data File | Rare |
| .alc | Dynamics AX Label Description File | Uncommon |
| .ald | Dynamics AX Application Label Data File | Average |
| .ali | Dynamics AX Label Index File | Average |
| .amb | AIMMS Model File | Average |
| .amsorm | OnLine Ringman Auction Client File | Average |
| .amu | PictureGear Studio Photo Album File | Rare |
| .an1 | Street Atlas USA Draw File | Uncommon |
| .anme | Anime Studio Document | Common |
| .ans | HotDocs Binary Answer File | Uncommon |
| .anx | HotDocs Answer File | Average |
| .aph | Ability Album File | Uncommon |
| .arc | Nintendo Archive File | Rare |
| .arh | ArheoStratigraf Project File | Rare |
| .as | AppleSingle File | Rare |
| .ashprj | Ashampoo Burning Studio Project | Average |
| .asm | Pro/ENGINEER Assembly File | Uncommon |
| .asnd | Adobe Sound Document | Average |
| .asr | Adobe Photoshop Scratch File | Rare |
| .ast | ClarisWorks Assistant File | Uncommon |
| .atf | Axon Text File | Average |
| .ats | Advanced ETL Transformation Script | Average |
| .avc | Kaspersky Virus Database | Average |
| .avenirproj | StoryMill Project | Uncommon |
| .avj | AntiVir Job File | Uncommon |
| .avl | AntiVir Status Report File | Uncommon |
| .avp | AntiVir Profile | Average |
| .aw | Answer Wizard File | Common |
| .awdb | Access Walker Database File | Average |
| .awg | Activeworlds Object Group File | Average |
| .azw | Amazon Kindle eBook File | Common |
| .azw1 | Amazon Topaz eBook | Common |
| .azz | AZZ Cardfile Database File | Uncommon |
| .bafl | BurnAware File List | Uncommon |
| .bar | Brew MP Binary Application Resource File | Uncommon |
| .bc | Adobe Bridge Cache File | Uncommon |
| .bcc | Calendar Creator File | Average |
| .bci | Belarc Advisor Report File | Average |
| .bcm | Business Contact Manager File | Average |
| .bct | Adobe Bridge Thumbnail Cache File | Uncommon |
| .bdc | Babylon Dictionary File | Average |
| .bdf | Binary Data File | Uncommon |
| .bdic | Chrome Dictionary File | Average |
| .bfx | Bitware Fax Document | Uncommon |
| .bgl | Babylon Glossary File | Average |
| .bgt | Graphics Accounts Data File | Average |
| .bim | Bytessence InstallMaker Document | Uncommon |
| .bin | Generic Binary File | Average |
| .bjo | TablEdit Tablature File | Uncommon |
| .bk | FrameMaker Book File | Average |
| .bkk | BookBuddi eBook File | Average |
| .blb | Blob Data File | Average |
| .bld | Envisioneer Building Project File | Common |
| .blg | Windows Binary Performance Log File | Common |
| .blg | BibTeX Log File | Average |
| .bln | Golden Software Blanking File | Uncommon |
| .bm2 | Boardmaker Interactive Board File | Uncommon |
| .bms | BIOWRAP Multi-Layer Security File | Average |
| .bok | TestGen Testbank File | Average |
| .book | iBooks Author Document | Average |
| .book | Budget In Brief Book File | Uncommon |
| .booktemplate | iBooks Author Document Template | Uncommon |
| .box | E-mail Mailbox | Average |
| .brain | PersonalBrain Mind Map File | Average |
| .brd | EAGLE Circuit Board File | Average |
| .brw | Calyx Point Borrower File | Average |
| .btf | NationsBank Check Images | Uncommon |
| .btif | NationsBank Check Image File | Rare |
| .btinstall | uTorrent Installer File | Rare |
| .btm | BizTalk Map File | Average |
| .bvp | VodaHost BlueVoda Project File | Common |
| .c3d | Coordinate 3D File | Average |
| .caf | Class Action Gradebook File | Average |
| .cap | Packet Capture File | Average |
| .cav | Comodo Virus Definitions File | Average |
| .cbg | CyberGauge Data File | Average |
| .cca | Multimedia Fusion File | Average |
| .cca | cc:Mail Archive File | Uncommon |
| .cch | Corel Chart File | Average |
| .ccp | RIB Import Converter Profile | Uncommon |
| .ccr | ASTM Continuity of Care Record | Average |
| .cct | Director Protected Cast Resource | Uncommon |
| .cdf | Affymetrix Chip Definition File | Average |
| .cdf | NetCDF Format File | Uncommon |
| .cdf | Nominal Small Business Accounting Company Data File | Uncommon |
| .cdf | Content Definition File | Uncommon |
| .cdf | Common Data Format | Average |
| .cdp | CD/Spectrum Pro File | Uncommon |
| .cdp | ConceptDraw PROJECT File | Uncommon |
| .cdpx | ConceptDraw PROJECT XML File | Uncommon |
| .cdpz | ConceptDraw PROJECT Document | Average |
| .cdr | Crash Data Retrieval Data File | Rare |
| .cdx | ChemDraw Exchange File | Average |
| .cdx | Compound Index File | Average |
| .cdxml | ChemDraw XML File | Uncommon |
| .cel | Affymetrix Probe Results File | Common |
| .cel | Battery 3 Drum Cell File | Uncommon |
| .celtx | Celtx Project File | Average |
| .cfs | CFS Console File | Rare |
| .chg | Quicken Online Data File | Rare |
| .chk | InterCheck Checksum Database | Uncommon |
| .chn | Ethnograph Data | Average |
| .ckt | CircuitMaker File | Average |
| .cl2 | HY-TEK Meet Results File | Uncommon |
| .cl4 | Easy CD Creator 4 Project File | Uncommon |
| .classlist | SMART Notebook Class List File | Average |
| .clb | ICQ Contact List | Uncommon |
| .clg | Collage Maker Project File | Average |
| .clix | CLIX Command File | Uncommon |
| .clk | Corel R.A.V.E Project File | Average |
| .clm | GenePattern CEL Descriptor File | Rare |
| .clm | MagicJack Call Log File | Average |
| .clp | Windows Clipboard File | Uncommon |
| .clx | Standard Dictionary File | Average |
| .cmap | CmapTools Concept Map File | Average |
| .cmbl | Logger Pro Data File | Uncommon |
| .cml | Chemical Markup Language File | Average |
| .cms | Connection Manager Service Profile | Uncommon |
| .cn1 | CNR Modem Initialization Data File | Rare |
| .cna | Catena Project File | Average |
| .collection | Adobe Bridge Collection File | Uncommon |
| .contact | Windows Contact File | Common |
| .cor | Trimble Corrected SSF File | Average |
| .cpf | Cognos Project File | Average |
| .cpk | DTM Test Log File | Average |
| .cpmz | Miradi/ConPro Project File | Uncommon |
| .cptl | Adobe Captivate Project Template File | Uncommon |
| .cptx | Adobe Captivate Project File | Average |
| .crev | Adobe Captivate Commentable SWF File | Average |
| .crtx | Office 2007 Chart Template File | Average |
| .cry | CryENGINE Map File | Average |
| .csa | PNA Code Calset File | Average |
| .csv | Comma Separated Values File | Very Common |
| .ctf | WhereIsIt Catalog | Average |
| .ctl | StepMania SMZIP Package Description File | Uncommon |
| .ctm | CrazyTalk Model File | Average |
| .ctt | Messenger Contact List | Average |
| .ctv | Citavi Project | Average |
| .ctv3 | Citavi 3 Project File | Average |
| .cub | Analysis Services Cube File | Common |
| .cursorfx | CursorFX Theme File | Average |
| .curxptheme | CursorXP Theme File | Average |
| .cva | Canvas Sequence Set | Average |
| .cvd | ClamAV Virus Definitions File | Average |
| .cvn | CineVision Encoding Session | Average |
| .cwk | ClarisWorks Document | Average |
| .cwz | Circuit Wizard File | Uncommon |
| .cxt | Director Protected Cast File | Rare |
| .cyo | Clustify Output File | Average |
| .cys | Clustify Summary File | Rare |
| .cys | Cytoscape Session File | Average |
| .da2 | DeepAnalysis Save File | Uncommon |
| .daf | Digital Anchor File | Uncommon |
| .dal | DVD-lab Project File | Average |
| .dam | DeltaMaster Analysis Model | Average |
| .dap | Diet Analysis Profile | Uncommon |
| .das | DeltaMaster Analysis Session | Average |
| .dat | Data File | Very Common |
| .data | Analysis Studio Offline Data File | Uncommon |
| .db | QQ Account Database File | Uncommon |
| .db- | Norton Nprotect Database File | Rare |
| .dbd | DemoShield Project | Average |
| .dbf | FoxPro Table | Average |
| .dbgsym | Debug Symbols File | Uncommon |
| .dcf | Document Computation Format | Average |
| .dcl | DumpSec Report File | Uncommon |
| .dcm | DiskCatalogMaker Catalog File | Average |
| .dcmd | DiskCatalogMaker Thumbnail-Enabled Catalog | Average |
| .dcmf | DiskCatalogMaker Catalog | Average |
| .dcpf | Disc Copier Project File | Uncommon |
| .dcpr | Adobe DNG Camera Profile Recipe File | Average |
| .dct | AutoCAD Dictionary File | Uncommon |
| .ddb | Digidesign Database | Uncommon |
| .ddc | DivX Descriptor File | Average |
| .ddcx | DivX Descriptor 2 File | Average |
| .ddt | Diagram Designer Template | Uncommon |
| .des | QuickBooks Forms Template | Uncommon |
| .dex | DEXIS Digital X-ray File | Uncommon |
| .dfm | Midas ViewPoint Display Form | Average |
| .dfproj | DVD Flick Project | Average |
| .dgs | 3D Screen Creator Scene File | Uncommon |
| .dhcd | DHCD Computing Application Data File | Uncommon |
| .dia | Do It Again Task File | Uncommon |
| .dif | Data Interchange Format | Common |
| .dii | Summation Batch Load File | Average |
| .dita | DITA Document | Average |
| .ditamap | DITA Topic Map File | Average |
| .ditaval | DITA Conditions File | Average |
| .djm | Dynojet Map File | Uncommon |
| .dm2 | Toad Data Modeler 2 File | Average |
| .dmc | Datamartist Data Canvas File | Average |
| .dmo | Derive Demo | Uncommon |
| .dmo | Movienizer Database File | Uncommon |
| .dmsk | DivX Temporary Video Data File | Uncommon |
| .dmsp | PhotoSuite Project File | Common |
| .dna | GenePool DNA File | Uncommon |
| .dnc | Dance Database File | Rare |
| .dockzip | ObjectDock File | Average |
| .dot | Graphviz Graph File | Rare |
| .dpb | DVD Profiler Backup File | Uncommon |
| .dpn | Depiction Data File | Average |
| .dps | Kingsoft Presentation File | Average |
| .dpt | Kingsoft Presentation Template | Uncommon |
| .dpx | VASCO DIGIPASS File | Uncommon |
| .drf | Dynojet Run File | Uncommon |
| .drl | Gerber Drill Rack File | Average |
| .dsb | Orchida Embroidery File | Average |
| .dsc | Celestia Deep Space Catalog File | Uncommon |
| .dsd | Diet Studio Data File | Uncommon |
| .dsx | Diet Studio XML File | Uncommon |
| .dsy | Directory Synchronizer Project File | Average |
| .dsz | Orchida (OES) Embroidery File | Average |
| .dta | Chain Engineering Database | Rare |
| .dtd | Design Tools Draw File | Uncommon |
| .dtr | DATroniC Data Recording | Average |
| .dvdproj | iDVD Project File | Average |
| .dvds | DVDStyler Project File | Average |
| .dvo | Cook'n Cookbook File | Average |
| .dwi | Dance With Intensity Song File | Average |
| .dwp | DarkWave Studio Project File | Uncommon |
| .dws | Adobe Dreamweaver Site Cache File | Average |
| .dwz | DVD MovieFactory Project File | Uncommon |
| .eap | Enterprise Architect Project | Average |
| .eas | RSLogix Symbol File | Uncommon |
| .ebuild | Portage eBuild Script | Average |
| .ec0 | MetroCount Traffic Data File | Uncommon |
| .ecc | dvdisaster Error Correction File | Uncommon |
| .ecl | Management-Ware Mass Mailing News E-Campaign List | Average |
| .edat | E-DataAid 1.x File | Average |
| .edat2 | E-DataAid 2.0 File | Average |
| .edf | ESRF Data File | Uncommon |
| .edf | Estimator Data File | Average |
| .edfx | Estimator.NET Estimate File | Rare |
| .edg | Edge Diagrammer File | Average |
| .eep | EEPROM Data File | Rare |
| .efp | Exchange Forms Designer Template | Average |
| .efx | eFax Document | Very Common |
| .egp | Easy Grade Pro Gradebook File | Average |
| .emb | Pfaff Embroidery Design File | Uncommon |
| .emb | Everest Embedded Bank File | Average |
| .emb | Embroidery Design File | Average |
| .emd | ChessBase Tablebase | Average |
| .emlxpart | Mail Message Attachment | Average |
| .emrg | E-Merge 1.x Data File | Uncommon |
| .emrg2 | E-Merge 2.0 Data File | Uncommon |
| .enc | Electronic Navigation Chart File | Uncommon |
| .enex | Evernote Archive | Common |
| .env | Adobe Dictionary Data File | Uncommon |
| .enw | EndNote Citation File | Uncommon |
| .epf | Edgecam Educational Part File | Average |
| .epp | TalaPhoto Project | Uncommon |
| .epp | Efficient PPC Project File | Uncommon |
| .epub | Open eBook File | Very Common |
| .epw | EnergyPlus Weather Data File | Common |
| .er1 | ERWin Entity Relationship Diagram | Average |
| .es | E-Studio 1.x Experiment File | Average |
| .es2 | E-Studio 2.0 Experiment File | Average |
| .esb | Es-Builder Book File | Average |
| .ese | Millions Email Generator Email List File | Rare |
| .esp | ACD/Labs Dataset | Uncommon |
| .esq | Embroidery Sequence File | Rare |
| .est | Construction Cost Estimate File | Uncommon |
| .esx | Xactimate Insurance Claims Estimate | Average |
| .et | Easiteach Lesson File | Uncommon |
| .et | Kingsoft Spreadsheets File | Average |
| .etd | Adobe Reader EBX Transfer Data File | Average |
| .ett | Kingsoft Spreadsheets Template | Uncommon |
| .ev | Echoview File | Average |
| .ev3 | Team Manager Meet Event File | Uncommon |
| .evy | Envoy File | Rare |
| .ews | EasyWorship Schedule File | Uncommon |
| .exif | Exchangeable Image Information File | Common |
| .exl | Export Lister File | Uncommon |
| .exp | Export File | Average |
| .exp | Aurora Expert Trace File | Uncommon |
| .exx | IBM Linkway MsgPut File | Average |
| .fa | FASTA Formatted Sequence File | Average |
| .familyfile | Reunion Family File | Average |
| .fasta | FASTA Sequence File | Average |
| .fdb | Portfolio Catalog | Common |
| .fdb | Art Explosion Catalog | Average |
| .fdm | Exchange Forms Designer Form Message | Average |
| .fdt | Lucene Field Data File | Uncommon |
| .fdt | Impromptu Function Description Table File | Rare |
| .ffd | Flat File Descriptor | Uncommon |
| .ffd | SharePoint FFDDumper Log | Rare |
| .ffo | Adobe Photoshop File Information File | Rare |
| .ffwp | FormsForWeb Packet | Average |
| .fhc | FHC Data File | Average |
| .fid | File Expander Engine Descriptions Database | Uncommon |
| .fil | Files List Object File | Average |
| .flame | Fractal Flame File | Average |
| .flipchart | ActivInspire Flipchart File | Average |
| .flk | Folder Lock File | Average |
| .fll | FoxPro Dynamic-Link Library | Average |
| .flo | iGrafx FlowCharter File | Average |
| .flo | RFFlow Flowchart File | Average |
| .flow | Expression SketchFlow Data File | Average |
| .flp | Flash Project | Rare |
| .flp | ActivPrimary Flipchart File | Average |
| .flt | Flight Simulator Saved Flight | Average |
| .flwa | Folder Lock Wallet File | Average |
| .fmt | WinRAR Format File | Rare |
| .fnbk | Food Network Recipe Manager Data File | Uncommon |
| .fnrecipes | Food Network Recipe File | Average |
| .fo | XSL-FO Form | Average |
| .fob | Dynamics NAV Object Container File | Average |
| .folx | Folx Download File | Uncommon |
| .fop | InfoZoom Protected Data File | Average |
| .fox | InfoZoom Data File | Average |
| .fpsl | FileMaker Pro Snapshot Link | Average |
| .fqc | FAQ Creator File | Rare |
| .frl | Electronic Form Loader File | Rare |
| .frm | ADL Form | Uncommon |
| .fro | dBASE IV Compiled Report | Average |
| .fsb | FMOD Sample Bank File | Average |
| .fsc | Practical Scriptwriter File | Average |
| .fss | Splitty Data Split File | Uncommon |
| .ftl | Family Tree Legends File | Uncommon |
| .ftm | Family Tree Maker for DOS File | Uncommon |
| .ftw | Family Tree Maker File | Average |
| .fxf | BigFix Action File | Uncommon |
| .fxp | Adobe Flex Project File | Common |
| .gal | GenePix Array List File | Average |
| .gallery | SMART Notebook Gallery File | Average |
| .gallerycollection | SMART Notebook Gallery Collection File | Average |
| .galleryitem | SMART Notebook Gallery Item File | Average |
| .gan | GanttProject Project File | Average |
| .gbr | Gerber File | Very Common |
| .gc | GraphClick File | Average |
| .gcw | Microsoft Mathematics Worksheet | Common |
| .gcx | Grapher Graph File | Average |
| .gdf | GUESS Graph Data Format File | Uncommon |
| .ged | GEDCOM Genealogy Data File | Common |
| .gedcom | GEDCOM Genealogy File | Average |
| .gen | ArcView ARC/INFO UnGenerate file | Uncommon |
| .gexf | Graph Exchange XML Format File | Uncommon |
| .ggb | GeoGebra Document | Average |
| .gis | CFS Console Game Installer Settings File | Rare |
| .gld | Ground Loop Design Work File | Average |
| .gls | Babylon Glossary File | Average |
| .gml | Graph Modeling Language File | Average |
| .gms | Gesture and Motion Signal File | Average |
| .gno | GenoPro Genealogy Tree File | Average |
| .gnp | GNPeak Output File | Rare |
| .gnutar | GNU Tar Archive | Rare |
| .gp3 | Guitar Pro 3 File | Uncommon |
| .gpf | Grant Agreement Preparation Form | Uncommon |
| .gpi | Garmin Point of Interest File | Common |
| .gpj | Grapher Project File | Average |
| .gpr | GenePix Results File | Average |
| .gpr | Babylon Glossary Builder Project File | Uncommon |
| .gra | Microsoft Graph File | Average |
| .grade | GradeStat Document | Average |
| .graphml | GraphML File | Average |
| .graphmlz | Zip Compressed GraphML File | Uncommon |
| .grd | Surfer Grid File | Average |
| .grf | Generic Graph File | Rare |
| .grf | DPlot Graph File | Common |
| .grf | CloverETL Data Transformation Graph | Average |
| .grf | Grapher Graph File | Average |
| .grib | Gridded Binary File | Uncommon |
| .grk | Gradekeeper Class Gradebook File | Average |
| .grp | SmarterMail Group File | Average |
| .grr | Gradekeeper Class Roster File | Average |
| .grt | Grapher Template | Uncommon |
| .grv | Office Groove File | Average |
| .gs | GemStone Document | Average |
| .gtar | GNU Tar Archive | Rare |
| .gtp | Guitar Pro File | Average |
| .gui | Dr.Explain Project File | Average |
| .gwk | GraphiCode PCB Job File | Average |
| .gwp | Greetings Workshop Project File | Uncommon |
| .gxl | Graph Exchange Language File | Uncommon |
| .hal | HotDocs Answer Library | Average |
| .hcc | HydroCAD Prefab Chamber Data File | Average |
| .hce | HydroCAD Hydrograph Data File | Average |
| .hci | HydroCAD IDF Data File | Average |
| .hcl | HotDocs Clause Archive | Average |
| .hcr | HydroCAD Rainfall Curve Data File | Average |
| .hcu | Hydrograph Units Definitons File | Average |
| .hcx | ChartXL Chart | Rare |
| .hda | HotDocs Auto-Assemble File | Average |
| .hdf | Hierarchical Data Format File | Common |
| .hdi | HotDocs Auto-Install File | Average |
| .hdl | HotDocs Library File | Average |
| .hdpmx | HotDocs Publisher Mapping XML File | Uncommon |
| .hdumx | HotDocs User Mapping XML File | Uncommon |
| .hif | Quicken Online File | Rare |
| .hkdb | Apple iTunes Library File | Uncommon |
| .hl | HeuristicLab Storage File | Average |
| .hm3 | Help & Manual 3 Project | Uncommon |
| .hml | HostMonitor TestList File | Average |
| .hmt | HighMAT File | Rare |
| .hmxp | Help & Manual XML Project | Average |
| .hmxz | Help & Manual Compressed Project | Average |
| .hpp | Haluha Pearls File | Rare |
| .hs2 | HyperRESEARCH 2 Study File | Average |
| .hsk | Huskey Truss & Building Supply Import File | Rare |
| .hst | History File | Average |
| .htb | Audacity Help File | Rare |
| .htg | HackTheGame Mission Pack | Uncommon |
| .huh | HydroCAD Unit Hydrograph Definitions File | Average |
| .hvc | HotDocs Variable Collection File | Uncommon |
| .hyv | Team Manager Meet Event File | Average |
| .i5z | IUCLID 5 Import/Export File | Average |
| .iba | iBooks Author Document | Common |
| .ibatemplate | iBooks Author Document Template | Average |
| .ibcd | InstantBingoCard Document | Average |
| .ibooks | Multi-Touch iBook | Very Common |
| .icalevent | iCal Event File | Uncommon |
| .icaltodo | iCal To Do File | Uncommon |
| .ichat | iChat Saved Chat Log | Uncommon |
| .id2 | Windows Live Messenger Emoticon File | Common |
| .idx | Navigation POI File | Average |
| .idx | HMI Historical Log Index File | Average |
| .ies | IES Photometric Data File | Average |
| .ifaith | iFaith SHSH File | Uncommon |
| .igc | Anime List Builder Input File | Average |
| .ii | IconWorkshop Extended Information File | Common |
| .iif | Intuit Interchange Format File | Average |
| .imr | Impromptu Report File | Average |
| .imt | My Time Data File | Average |
| .incp | InCopy CS3 Package File | Uncommon |
| .ink | Mimio Ink Data File | Uncommon |
| .inp | Abaqus Input File | Average |
| .ins | Inspiration File | Uncommon |
| .ins | LaTeX Installer Script | Average |
| .inx | Compiled Script | Average |
| .ip | IconPackager Theme File | Average |
| .ipmeta | Apple iPhoto Metadata File | Average |
| .ipr | iProcrastinate Data File | Uncommon |
| .iproject | iClone Project File | Uncommon |
| .irock | intelliRock Sensor Data File | Average |
| .irp | Internet Researcher Project File | Uncommon |
| .irr | Brewer Lamp File | Uncommon |
| .irx | Brewer Irradiation File | Rare |
| .is1 | Synergy/DE Data Index File | Rare |
| .is1 | M3 Sakura Real-Time Save 1 File | Rare |
| .isf | Inspiration Flowchart Document | Average |
| .ish1 | Animation-ish Wiggledoodle-ish Document | Average |
| .ish2 | Animation-ish FlipBook-ish Document | Average |
| .ish3 | Animation-ish Advanced-ish Document | Average |
| .ist | Inspiration Template | Uncommon |
| .ite | iTunes Extras File | Average |
| .itl | iTunes Library File | Average |
| .itlp | iTunes LP Album File | Average |
| .itm | iThink Model File | Average |
| .itmsp | iTunes Store Package | Common |
| .itn | TomTom Navigator Itinerary File | Average |
| .itx | ITX Form Template | Average |
| .iup | Fritz Update File | Uncommon |
| .ivc | InteliSea Vessel Configuration File | Uncommon |
| .ivs | Initialization Vector File | Average |
| .ivt | Beyond 20/20 Table File | Average |
| .iw | Chain Engineering Database File | Uncommon |
| .ix2 | WordPerfect Address Book File | Average |
| .ixb | Ulead Disc Image | Average |
| .jasper | JasperReports Data File | Average |
| .jbi | Motoman Robot Job File | Average |
| .jdb | Symantec Endpoint Protection Update File | Common |
| .jef | Janome Embroidery Format | Average |
| .jmp | JMP Data File | Average |
| .jnt | Windows Journal File | Common |
| .joboptions | Adobe Joboptions File | Average |
| .joined | HJ-Split Data File | Average |
| .jph | JProbe Memory Snapshot | Average |
| .jrprint | JasperReports Print File | Common |
| .jrxml | JasperReports Layout File | Average |
| .jude | JUDE Project File | Average |
| .kap | BSB Chart Image File | Average |
| .kbs | Keyboard Script File | Rare |
| .kdbx | KeePass Password Database | Average |
| .kdc | Kaspersky Virus Database File | Common |
| .key | Keynote Presentation | Very Common |
| .kid | Kidspiration Document | Average |
| .kismac | KisMAC Webservice File | Average |
| .koob | Koob E-Book File | Rare |
| .kpf | Komodo Project File | Average |
| .kpp | Kid Pix Presentation | Average |
| .kpr | KPresenter Presentation | Average |
| .kpx | Kid Pix Picture | Average |
| .kpz | Komodo Template File | Average |
| .kth | Keynote Theme | Average |
| .kvtml | KWordQuiz File | Uncommon |
| .l | Game of Life File | Rare |
| .l6t | Line 6 Tone File | Average |
| .laccdb | Microsoft Access Lock File | Uncommon |
| .las | LIDAR Data Exchange File | Average |
| .lay | Tecplot Layout File | Average |
| .lbl | NiceLabel Template File | Average |
| .lbx | FoxPro Label File | Uncommon |
| .lcd | ABBYY Language File | Average |
| .lcm | Lipikar Custom Map File | Average |
| .ld2 | Lingoes Dictionary File | Average |
| .ldf | SQL Server Transaction Log File | Average |
| .ldf | Lingoes Dictionary Source File | Uncommon |
| .ldif | LDAP Data Interchange Format File | Average |
| .lex | Adobe Linguistic Library Data File | Uncommon |
| .lfp | IPRO LFP File | Average |
| .lgf | PMSCAN Log File | Uncommon |
| .lgh | HMI Historical Log File | Average |
| .lgi | Multimedia Logic File | Average |
| .lgl | Large Graph Layout Edge File | Rare |
| .lib | Generic Data Library | Common |
| .lif | TurboTax Information Archive | Rare |
| .livereg | Symantec Antivirus Session File | Average |
| .liveupdate | Symantec LiveUpdate File | Common |
| .lix | ExtendSim Simulation Software Library | Average |
| .lix | Logos Library System File | Average |
| .llb | LabVIEW Library File | Average |
| .lms | LenMus Score File | Average |
| .lmx | Landmark Exchange File | Average |
| .lng | MAME Language File | Uncommon |
| .lng | Application Language Support File | Uncommon |
| .lng | AVG Language File | Uncommon |
| .lnt | LiveNote Case File | Uncommon |
| .loc | GPS Location File | Average |
| .localstorage | Chrome Local Storage Data File | Uncommon |
| .log | AntiVir Report Log File | Average |
| .lp7 | LP7 Digitally Signed File | Average |
| .lpdb | Librarian Pro Database File | Average |
| .lpk | Tecplot Layout Package | Average |
| .lrcat | Adobe Photoshop Lightroom Catalog File | Average |
| .lrdata | Adobe Photoshop Lightroom Data File | Average |
| .lrf | Sony Portable Reader File | Average |
| .lrs | Librie Reader Source File | Average |
| .lrx | Sony Portable Reader File | Average |
| .ls3 | Band-in-a-Box Third-Party Styles File | Average |
| .lsf | Logos Library System File | Average |
| .lsl | LightScribe Label | Average |
| .lsp | LANsurveyor Poll List | Average |
| .lsr | LANsurveyor Report | Average |
| .lst | LightScribe Label Template | Uncommon |
| .lsu | LANsurveyor Map | Average |
| .lvm | LabVIEW Measurement File | Average |
| .lvw | Livewire Document | Uncommon |
| .lw4 | Lightwright File | Average |
| .ly | LilyPond File | Average |
| .m | Mathematica Input File | Common |
| .macbin | Macbinary Encoded File | Uncommon |
| .maf | Mutation Annotation Format File | Average |
| .mag | Magic Circuit Layout File | Uncommon |
| .mai | Microsoft Mail File | Average |
| .map | Weather Defender Map | Uncommon |
| .mart | MartView eBook File | Average |
| .mas | MEGA Alignment Sequence File | Uncommon |
| .mat | MATLAB MAT-File | Common |
| .mbb | ManaBook Book File | Rare |
| .mbd | Multimedia Builder Project File | Average |
| .mbf | Microsoft Money Backup File | Average |
| .mbg | Mailbag Assistant Mailbox File | Average |
| .mbg | Microsoft Mailbag | Average |
| .mbl | Logger Pro Data File | Uncommon |
| .mbp | Mobipocket Notes File | Average |
| .mbx | Outlook Express Mailbox | Average |
| .mc1 | MedCalc Data File | Average |
| .mcd | Mathcad Document | Common |
| .mcxe | MedicinesComplete Data File | Rare |
| .md | Moneydance Financial Data File | Average |
| .md8 | Mediator Project File | Average |
| .md8 | GarageCUBE Modul8 Project | Uncommon |
| .mdb | Avid Media Database | Average |
| .mdc | Multi Dimension Cube File | Average |
| .mdf | Measurement Data Format File | Average |
| .mdl | Rational Rose Model File | Average |
| .mdl | Simulink Model File | Average |
| .mdm | HLM Multivariate Data Matrix File | Average |
| .mdt | Microsoft Access Data File | Uncommon |
| .mdx | Rational XDE Model File | Uncommon |
| .mdx | Multiple Index File | Average |
| .mdz | Access Wizard Template | Uncommon |
| .meg | MEGA Data File | Average |
| .mem | Mnemosyne Card Collection | Uncommon |
| .menc | Windows Mobile Encrypted File | Common |
| .merlin2 | Merlin Project File | Average |
| .met | eMule Resource File | Common |
| .mex | Macro Express File | Average |
| .mfa | MobileFrame App File | Average |
| .mfe | MobileFrame Enterprise Data File | Uncommon |
| .mfl | Mozilla FastLoad File | Average |
| .mfo | MobileFrame Object File | Uncommon |
| .mfo | Perl ModInfo Descriptor File | Average |
| .mfp | Macromedia FlashPaper Document | Average |
| .mfp | MobileFrame Package | Average |
| .mft | Kaspersky File Table | Uncommon |
| .mfu | MobileFrame Update File | Average |
| .mfv | MobileFrame Device Pack File | Uncommon |
| .mgc | MGCSoft Equation Illustrator File | Rare |
| .mhp | Maths Helper Plus File | Uncommon |
| .mindnode | MindNode Document | Average |
| .mission | MissionMaker Project File | Uncommon |
| .mit | MineEdit Inventory Template File | Rare |
| .mls | Milestones Simplicity File | Average |
| .mm | FreeMind Mind Map | Average |
| .mm6 | Money Manager 6 File | Uncommon |
| .mma | Master Album Maker Photo Album File | Uncommon |
| .mmap | MindManager Map File | Average |
| .mmc | Microsoft Media Catalog | Average |
| .mmf | Microsoft Message File | Uncommon |
| .mml | Microsoft Clip Organizer File | Rare |
| .mmm | Money Manager File | Uncommon |
| .mmp | MindManager Mind Map | Average |
| .mmp | Master Album Maker Project | Average |
| .mmu | myPM Merge Data File | Uncommon |
| .mmw | AceMoney Money File | Average |
| .mmw | Microsoft Clip Organizer Media Catalog File | Rare |
| .mnc | My Notes Center Notebook | Average |
| .mng | Yamaha PSR Disk Manager File | Rare |
| .mnk | My Notes Keeper Notebook | Average |
| .mno | Macromedia Design Note | Average |
| .mny | Microsoft Money File | Uncommon |
| .mobi | Mobipocket eBook | Average |
| .moho | Anime Studio Animation Project | Average |
| .mol | MDL Molfile | Average |
| .money | Money Data File | Average |
| .mosaic | MacOSaiX Mosaic File | Average |
| .mox | ExtendSim Simulation Software Model | Average |
| .mpd | File List Creator Playlist | Uncommon |
| .mpi | InstallJammer Project File | Uncommon |
| .mpj | RoboHelp HTML Project | Average |
| .mpj | Minitab Project File | Uncommon |
| .mpp | MobileFrame Project Publisher File | Average |
| .mpp | Microsoft Project File | Common |
| .mpr | FileMaker Dictionary File | Uncommon |
| .mps | Mathematical Programming System File | Average |
| .mpt | Microsoft Project Template | Average |
| .mpx | Microsoft Project Exchange File | Common |
| .mpz | Miradi Project File | Average |
| .mpzip | Multisim Pack File | Uncommon |
| .mq4 | MetaTrader Custom Indicator | Average |
| .ms10 | Multisim 10 Circuit Design File | Average |
| .ms8 | Multisim 8 Circuit Design File | Uncommon |
| .msb | Oracle Binary Message File | Average |
| .msc | MuseScore Composition File | Uncommon |
| .msp | ClarisWorks Dictionary File | Rare |
| .mss | MyScreenSaver Builder File | Uncommon |
| .mtf | Mortality Table File | Uncommon |
| .mth | Derive Math File | Average |
| .mtm | Macrofocus TreeMap File | Uncommon |
| .mts | MEGA Tree Session File | Average |
| .mtt | MetadataTouch Template | Uncommon |
| .mtw | Minitab Worksheet File | Average |
| .muf | Alpha Five Licence File | Uncommon |
| .mup | Music Publisher Score | Average |
| .mw | Maple Worksheet | Common |
| .mwf | MapGuide Author Map Window File | Common |
| .mws | Maple Classic Worksheet | Average |
| .mwx | MicroWorlds EX File | Uncommon |
| .mx | Mathematica Serialized Package File | Average |
| .mxad | Mandelbrot Explorer All Data File | Average |
| .mxc2 | MAGIX Cache File | Average |
| .mxi | Adobe Extension Information File | Average |
| .myi | MySQL MyISAM Index File | Average |
| .nam | MODFLOW Name File | Uncommon |
| .nam | Aqua3D Network File | Rare |
| .nap | McAfee ePO Network Associates Package | Average |
| .nbe | Nessus Report File | Uncommon |
| .nbk | SMART Notebook File | Average |
| .nbp | Mathematica Player Notebook File | Common |
| .nc | NetCDF File | Average |
| .ndb | ClamAV Extended Signature File | Uncommon |
| .ndif | Nokia Data File | Uncommon |
| .ndk | Lotus Notes Design Elements File | Average |
| .ndx | dBASE Index File | Common |
| .nessus | Nessus Network Security Scanner File | Average |
| .net | netViz Project File | Average |
| .neta | Netica Binary File | Average |
| .nfl | Nokia Flash Lite Package | Average |
| .nfo | Folio Views Infobase File | Rare |
| .nitf | National Imagery Transmission Format File | Average |
| .nmind | NovaMind Mind Map File | Average |
| .nmp | NewsMaker Project File | Uncommon |
| .nni | ANNI Neural Network Investing File | Uncommon |
| .nnp | ANNI Neural Network Portfolio File | Average |
| .not | Notation File | Common |
| .notebook | SMART Notebook File | Common |
| .np | Portfolio NetPublish File | Average |
| .npl | Nokia Playlist File | Average |
| .npr | Nuendo Project File | Average |
| .npt | Portfolio NetPublish Template | Average |
| .nrb | Nero CD-ROM Boot Compilation | Average |
| .nrc | Nero Disc Compilation File | Average |
| .nrd | Nero DVD-Video Compilation File | Average |
| .nrl | Autonomy Interwoven Link File | Average |
| .nrm | Nero Mixed Mode CD Compilation | Average |
| .nru | Nero UDF CD-ROM Compilation | Average |
| .nsq | NScheduler Data File | Average |
| .nsr | Nessus Security Report File | Uncommon |
| .ntf | Lotus Note Template | Average |
| .ntx | Clipper Index File | Uncommon |
| .nvdl | NVDL Script | Uncommon |
| .nvl | UniChem Results File | Average |
| .nvram | VMware NVRAM File | Uncommon |
| .nwp | Navisworks Presenter Material Palette File | Average |
| .nws | Windows Live Mail Newsgroup File | Average |
| .oab | Offline Address Book | Average |
| .obd | Office Binder Document | Average |
| .obj | Relocatable Object Code | Average |
| .od | Mascopt Graph Request File | Rare |
| .odc | OpenDocument Chart File | Uncommon |
| .odf | Open Document File | Rare |
| .odp | OpenDocument Presentation | Common |
| .odx | BizTalk Server Orchestration File | Average |
| .oeaccount | Windows Mail Account File | Common |
| .oeb | Open eBook File | Uncommon |
| .ofc | Open Financial Connectivity File | Average |
| .ofm | OmniForm Form | Average |
| .oft | Outlook File Template | Average |
| .ofx | Open Financial Exchange File | Average |
| .olk | Outlook Address Book File | Uncommon |
| .olk14category | Outlook Category File | Uncommon |
| .olk14contact | Outlook Contact File | Uncommon |
| .olk14event | Outlook Calendar Event File | Uncommon |
| .olk14group | Outlook Group File | Uncommon |
| .olk14mailaccount | Outlook Mail Account File | Uncommon |
| .olk14message | Outlook Message File | Average |
| .olk14msgsource | Outlook Email Message Data File | Uncommon |
| .olk14note | Outlook Note File | Uncommon |
| .olk14signature | Outlook Signature File | Uncommon |
| .olk14task | Outlook Task File | Rare |
| .olt | Orbit Downloads List | Uncommon |
| .omcs | Office Manager Access File | Uncommon |
| .omp | Office Manager Document Archive | Average |
| .ond | Lotus Notes Encapsulated Memo File | Average |
| .one | OneNote Document | Average |
| .oo3 | OmniOutliner 3 File | Average |
| .opd | Durango Document | Uncommon |
| .opf | FlipViewer FlipBook File | Uncommon |
| .opx | OrgPlus Org Chart | Average |
| .opx | FlipAlbum Photo Album File | Average |
| .or2 | Lotus Organizer 2 File | Rare |
| .or3 | IBM Lotus Organizer 97 File | Rare |
| .or4 | IBM Lotus Organizer 97 GS File | Uncommon |
| .or5 | Lotus Organizer 5 File | Uncommon |
| .or6 | Lotus Organizer 6 File | Average |
| .org | Lotus Organizer File | Uncommon |
| .otf | OpenTuft Tufting Design File | Uncommon |
| .otl | NoteTab Outline File | Average |
| .otln | Opal Outline File | Average |
| .otp | OpenDocument Presentation Template | Average |
| .out | Output File | Common |
| .ova | Open Virtual Appliance | Average |
| .ova | Octava Musical Score | Uncommon |
| .ovf | Open Virtualization File | Common |
| .p3 | Primavera P3 Project File | Average |
| .pab | Personal Address Book | Average |
| .paf | Personal Ancestral File | Average |
| .pbd | ProBID+ Data File | Uncommon |
| .pbk | Dial-Up Phone Book File | Average |
| .pc | Personal Composer File | Average |
| .pcap | Packet Capture Data | Average |
| .pcb | Printed Circuit Board Design File | Average |
| .pcr | PCMark Vantage Benchmark File | Common |
| .pd4 | Windows Live Photo Gallery Information File | Average |
| .pd5 | Windows Live Photo Gallery Information File | Average |
| .pdas | PDAStore Data Store File | Average |
| .pdb | Protein Data Bank File | Average |
| .pdd | Medtronic Programmer Data File | Rare |
| .pdfig | PDF Index Generator Project File | Average |
| .pdo | Pepakura Designer File | Average |
| .pds | Planetary Data System File | Average |
| .pdx | Adobe Acrobat Index File | Common |
| .pdx | Product Data eXchange File | Average |
| .peb | ProEST+ Buildings File | Uncommon |
| .pec | Brother Embroidery File | Rare |
| .pep | TurboProject Project File | Average |
| .pes | PhysicsEditor Sheet File | Uncommon |
| .pex | Merak Peep Data File | Average |
| .pf | Windows Prefetcher File | Uncommon |
| .pfc | AOL Personal File Cabinet | Common |
| .pfl | Family Lawyer Document | Uncommon |
| .pgpf | Password Generator Password File | Rare |
| .phb | Motorola Phone Book File | Average |
| .phd | Portable Heap Dump File | Uncommon |
| .phm | Pro Home Manager Data File | Average |
| .pi | Pi Calculation Data File | Average |
| .pis | PS2DIS Project File | Uncommon |
| .pjt | Didger Project File | Average |
| .pjx | FoxPro Project | Average |
| .pka | Packet Tracer Activity File | Average |
| .pkb | Oracle Package Body File | Average |
| .pkh | Oracle Package File | Average |
| .pks | Oracle Package Spec File | Average |
| .pkt | Packet Tracer Network Simulation Model | Average |
| .pln | Spaceman Planogram File | Uncommon |
| .pls | MYOB Accounting Data File | Average |
| .plt | Tecplot Binary Data File | Average |
| .plw | PicoLog Data File | Average |
| .pml | Process Monitor Log File | Average |
| .pmm | Pegasus Mail Mailbox File | Average |
| .pmm | MikuMikuDance PolygonMovieMaker File | Average |
| .pmo | Broderbund Print Meta Object File | Average |
| .pmr | Avid Persisent Media Record File | Average |
| .pmr | Performance Monitor Report | Uncommon |
| .pnproj | Programmer's Notepad Project File | Average |
| .pnpt | Programmer's Notepad Project Template | Uncommon |
| .pns | Popnoggin Subject File | Uncommon |
| .pnt | Popnoggin Theme File | Uncommon |
| .pod | OpenProj Project File | Average |
| .poi | Magellan Maestro Point of Interest File | Average |
| .por | SPSS Portable File | Average |
| .pos | Trimble Position File | Rare |
| .postal | TomTom Postal Code File | Uncommon |
| .pot | PowerPoint Template | Average |
| .potm | PowerPoint Open XML Macro-Enabled Presentation Template | Average |
| .potx | PowerPoint Open XML Presentation Template | Average |
| .pp | Pocket Physics Sketch File | Uncommon |
| .pp2 | PingPlotter Data File | Average |
| .ppf | Edgecam Pathtrace Part File | Common |
| .ppf | Transit NXT Pack Project File | Average |
| .ppf | Publisher Project File | Uncommon |
| .ppp | CyberLink PowerProducer Project | Average |
| .ppr | Project Planner Reader File | Average |
| .ppr | Cognos PowerPlay Report File | Uncommon |
| .ppr | ORF Report File | Rare |
| .pps | PowerPoint Slide Show | Very Common |
| .ppsm | PowerPoint Open XML Macro-Enabled Slide Show | Average |
| .ppsx | PowerPoint Open XML Slide Show | Common |
| .ppt | PowerPoint Presentation | Very Common |
| .pptm | PowerPoint Open XML Macro-Enabled Presentation | Common |
| .pptx | PowerPoint Open XML Presentation | Very Common |
| .prb | xyAlgebra Probabilities File | Rare |
| .prc | Corel Presentation | Rare |
| .prc | Mobipocket eBook File | Common |
| .pre | Lotus Freelance Graphics File | Uncommon |
| .prf | Plot Station Plot Request File | Rare |
| .prj | Project File | Common |
| .prj | AIMMS Project File | Average |
| .prn | Lotus 1-2-3 Formatted Text File | Uncommon |
| .pro4 | ProPresenter 4 Document | Average |
| .pro4pl | ProPresenter Playlist File | Average |
| .pro4plx | ProPresenter Playlist Bundle | Average |
| .pro4x | ProPresenter 4 Bundle File | Average |
| .prp | Rational Model Properties File | Uncommon |
| .prs | Harvard Graphics Presentation | Average |
| .prs | Calyx Point Prospect File | Uncommon |
| .prt | Presentations Template | Average |
| .prx | Primavera P3 Compressed Project File | Average |
| .prz | Freelance Graphics Presentation File | Uncommon |
| .psa | Photoshop Album Catalog File | Average |
| .psf | SPI Proxy Output File | Rare |
| .psf | PID Script File | Rare |
| .psf | GPS Prediction Support File | Uncommon |
| .psm | Prism Document | Uncommon |
| .pspd | PhotoSuite 5 Project File | Average |
| .pst | Outlook Personal Information Store File | Common |
| .psv | Pipe Separated Values File | Uncommon |
| .ptb | Power Tab File | Average |
| .ptf | Scrapbook Flair Template | Average |
| .ptk | Quicken Online Financial Data File | Rare |
| .ptn | PaperPort Thumbnail File | Average |
| .ptz | E-Transcript Bundle File | Common |
| .pvl | Instalit Library | Average |
| .pxa | XpressAccounts Data File | Uncommon |
| .pxc | Photodex Cache File | Uncommon |
| .pxf | Transit XV Pack Project File | Average |
| .pxj | RecordNow Project | Average |
| .pxl | Pocket Excel File | Average |
| .q07 | QuickTax 2007 Tax Return | Uncommon |
| .q08 | QuickTax 2008 Tax Return | Average |
| .q09 | QuickTax 2009 Tax Return | Average |
| .q3d | Quest3D Project File | Uncommon |
| .qb2005 | QuickBooks 2005 File | Rare |
| .qb2006 | QuickBooks 2006 File | Uncommon |
| .qb2007 | QuickBooks 2007 File | Uncommon |
| .qb2009 | QuickBooks 2009 File | Common |
| .qb2010 | QuickBooks 2010 File | Average |
| .qb2011 | QuickBooks 2011 File | Common |
| .qb2012 | QuickBooks 2012 File | Common |
| .qbw | QuickBooks Data File | Uncommon |
| .qdat | QuickTime Install Cache File | Rare |
| .qdf | Quicken Data File | Common |
| .qdf | Snapform File | Uncommon |
| .qdfm | Quicken Data File (Macintosh) | Average |
| .qdp | Quick and Dandy Plotter File | Average |
| .qel | Quicken Electronic Library | Average |
| .qfx | Quicken Financial Exchange File | Common |
| .qif | Quicken Interchange Format File | Common |
| .qm | Qt Compiled Translation Source File | Uncommon |
| .qpb | QuickBooks Point of Sale Data File | Average |
| .qpf | Quest3D Project | Uncommon |
| .qpf | Quartus II Project File | Average |
| .qph | Nokia Qt Phrase Books File | Uncommon |
| .qph | Quicken Price History File | Average |
| .qpm | Quick Pallet Maker Input Data | Average |
| .qrc | QuarkXPress Required Component File | Average |
| .qrp | QuickReport File | Average |
| .qsd | Quicken Data File | Uncommon |
| .qvp | ViewletBuilder Project File | Average |
| .qvw | QlikView Document | Common |
| .ral | WinRail Track Design File | Average |
| .rbt | Lego MINDSTORMS NXT Program | Average |
| .rcd | Arcade File | Rare |
| .rcg | Recog Character Recognition Set | Average |
| .rcx | REDCINE-X Project File | Average |
| .rda | R Data File | Uncommon |
| .rdata | R Workspace File | Average |
| .rdb | N64 ROM Database | Average |
| .rdx | Reflex Data File | Rare |
| .reb | Reimbursement Tracker Data File | Rare |
| .ref | Microsoft Train Simulator Reference File | Uncommon |
| .reference | Budget In Brief Reference File | Rare |
| .rel | Norton Internet Security Log File | Rare |
| .ret | BusinessObjects Template | Average |
| .rf1 | Retirement Forecast File | Rare |
| .rfa | Revit Family File | Average |
| .rfo | RoboForm Option File | Average |
| .rge | Entourage File Archive | Average |
| .rgmc | RootsMagic Genealogy Project File | Average |
| .rgo | RepliGo File | Average |
| .rhistory | R History File | Uncommon |
| .rl | R.viewer List File | Uncommon |
| .rmd | Reference Manager Data File | Uncommon |
| .rmuf | Alpha Five Runtime License File | Rare |
| .rmx | Reference Manager Index File | Uncommon |
| .rng | RELAX NG File | Uncommon |
| .rnq | Renque Model File | Average |
| .roca | RIB office Compressed Archive | Uncommon |
| .rod | Actuate Report Object Design File | Average |
| .rog | Roger 2 Input Data File | Rare |
| .roi | Shark Sales System Data File | Rare |
| .roi | Report Object Instance | Uncommon |
| .rou | Gerber Route File | Average |
| .rox | Roxio Project File | Common |
| .roxio | Roxio Project | Uncommon |
| .rp | Axure RP Project File | Common |
| .rpa | RIB Project Archive File | Uncommon |
| .rpd | Roleplay Designer Data File | Uncommon |
| .rpp | REAPER Project File | Average |
| .rpprj | Axure RP Shared Project File | Average |
| .rpt | Crystal Reports File | Common |
| .rrt | Rhapzode Resource Template | Uncommon |
| .rsc | Symbian Application Compiled Resource File | Average |
| .rsf | Riky's Soft Document | Rare |
| .rsp | RSLogix PLC Program File | Average |
| .rsv | RSView32 Project File | Average |
| .rsw | R&R SQL Report Writer Report File | Average |
| .rte | Revit Project Template | Average |
| .rte | Navigation Route | Average |
| .rtp | Gromacs Residue Topology Parameter File | Uncommon |
| .rvt | Revit Project File | Common |
| .rwg | Random Word Generator Project File | Rare |
| .rws | Retina Wireless Scanner File | Uncommon |
| .rzb | Red Zion Book File | Average |
| .s85 | Sabre Airline Solutions Chart | Average |
| .sam | Samurize Package | Uncommon |
| .sam07 | SAM 2007 Package | Rare |
| .sar | Sibelius Arrange Style | Average |
| .sav | SPSS Data File | Common |
| .sbd | Superbase Data Definition File | Uncommon |
| .sbd | Office Accounting Company Data File | Average |
| .sbf | SmartBroker Data | Rare |
| .sbq | Superbase QuickReports File | Uncommon |
| .sbt | Superbase Data Notes File | Rare |
| .sbw | US Treasury Savings Bonds Wizard File | Average |
| .sbx | ESRI Spatial Index File | Average |
| .sc45 | SuperCard Project File | Average |
| .sca | Norton AntiVirus Scan File | Average |
| .scd | TurboTax Tax Schedule List | Average |
| .scd | Data Rescue Saved Scan File | Uncommon |
| .scexcludb | Spring Cleaning Exclusions File | Rare |
| .scf | DNA Sequence Chromatogram File | Average |
| .scg | myPM SCG Definition File | Average |
| .sch | EAGLE Schematics File | Average |
| .sch | SuperCard Help Project File | Uncommon |
| .scm | Samsung Channel List File | Uncommon |
| .screstorelog | Spring Cleaning Restore Log | Rare |
| .scresults | Spring Cleaning Results File | Uncommon |
| .scx | SuperCard Help Project | Uncommon |
| .scz | SmartDraw Collection Package File | Average |
| .sdd | StarOffice Presentation | Uncommon |
| .sdf | Structure Data File | Common |
| .sdf | Standard Data File | Very Common |
| .sdinstall | Speckie Dictionary Installation File | Uncommon |
| .sdp | Session Description Protocol File | Average |
| .sdp | StarOffice Presentation File | Uncommon |
| .sdq | SAS Data File | Rare |
| .sds | SDS Apps Data File | Uncommon |
| .sds | OpenOffice.org Chart | Average |
| .sdz | NCI Compressed Database | Uncommon |
| .sel | LinkOne Selection List File | Uncommon |
| .sen | SenTest Data File | Average |
| .seo | SEO Note File | Average |
| .seq | DNA Sequence Text File | Uncommon |
| .ser | GeneMapper Project File | Uncommon |
| .sgml | Standard Generalized Markup Language File | Average |
| .sgn | Slax Boot File | Uncommon |
| .shc | Adobe Photoshop Contours File | Uncommon |
| .shw | Corel Presentation | Average |
| .shx | Shapefile Index File | Average |
| .sidx | StuffIt Archive Index File | Average |
| .sim | SAP Tutor File | Average |
| .skc | SideKick Card File | Rare |
| .skim | Skim Notes File | Uncommon |
| .skv | XLANG Schedule Drawing File | Uncommon |
| .skv | Semicolon Separated Values File | Average |
| .skx | XLANG Schedule File | Average |
| .sldtm | SDL Translation Memory File | Average |
| .sle | Sisulizer Package File | Average |
| .slk | Symbolic Link File | Average |
| .slp | Sisulizer Project File | Average |
| .snag | SnagIt Capture File | Common |
| .snapfireshow | Corel SnapfireShow File | Average |
| .sonic | DigitalMedia Project File | Rare |
| .soundpack | SoundPackager Sound Package | Uncommon |
| .sp45 | SuperCard Player File | Uncommon |
| .spb | Samsung Kies Phonebook File | Uncommon |
| .spk | Bright Spark Document | Uncommon |
| .spo | SPSS Statistical Data Output File | Uncommon |
| .sps | SPSS Program File | Common |
| .spt | AQW Trainer File | Uncommon |
| .spub | Disc Cover File | Average |
| .spv | SPSS Output Document | Common |
| .sq | Sysquake Program | Average |
| .sqd | SQ Data File | Average |
| .sqr | SQL Program File | Average |
| .squashfs | Squashfs File System File | Uncommon |
| .srf | Surfer Project File | Average |
| .ssc | Celestia Solar System Catalog File | Uncommon |
| .ssp | Screensaver Producer Project File | Average |
| .st45 | SuperCard Trial Project File | Uncommon |
| .sta | Adobe Photoshop Match Color Image Statistics File | Uncommon |
| .sta | ABAQUS Status File | Average |
| .stc | Celestia Star Catalog File | Uncommon |
| .stdl | Swift To-Do List Database | Average |
| .stf | Exchange 2000 Server Temporary File | Uncommon |
| .sti | StarOffice Presentation Template | Uncommon |
| .stk | Stickfigure Animator File | Average |
| .stl | Fireworks Style Library | Uncommon |
| .stm | Exchange Streaming Media File | Common |
| .stp | Analysis Studio Project Information File | Average |
| .stproj | Samsung Theme Document | Average |
| .str | dBASE Structure List Object File | Average |
| .stt | Kaspersky Statistics File | Uncommon |
| .sttpl | Samsung Theme Showcase File | Uncommon |
| .stu | Pinnacle Studio Project File | Average |
| .stw | STATISTICA Workbook | Rare |
| .sty | NewsMaker Story File | Rare |
| .styk | Stykz Stick Figure | Average |
| .stykz | Stykz Animation | Average |
| .sui | StarSplatter User Interface File | Rare |
| .svd | Scanning Vibrometer Data File | Rare |
| .svf | Serial Vector Format File | Common |
| .svw | SpecView File | Uncommon |
| .swk | StudyWorks Save File | Average |
| .sxi | StarOffice Impress Presentation | Average |
| .sy3 | Harvard Graphics Symbol File | Rare |
| .sylk | Microsoft Symbolic Link File | Uncommon |
| .szs | Wii Game Data File | Uncommon |
| .t01 | TaxCut 2001 File | Rare |
| .t02 | TaxCut 2002 File | Rare |
| .t03 | TaxCut 2003 File | Rare |
| .t04 | TaxCut 2004 File | Rare |
| .t05 | TaxCut 2005 Tax Return | Average |
| .t06 | TaxCut 2006 Tax Return | Average |
| .t07 | TaxCut 2007 Tax Return | Average |
| .t08 | TaxCut 2008 Tax Return | Common |
| .t09 | At Home 2009 Tax Return | Common |
| .t10 | At Home 2010 Tax Return | Common |
| .t2 | Textease 2000 File | Uncommon |
| .t2k | Teach2000 Document | Uncommon |
| .t2ks | Teach2000 Exam Results File | Uncommon |
| .t2kt | Teach2000 Exam File | Uncommon |
| .tar | Consolidated Unix File Archive | Common |
| .tax | TurboTax Tax Return | Uncommon |
| .tax08 | TurboTax 2008 Tax Return File | Rare |
| .tax09 | TurboTax 2009 Tax Return File | Rare |
| .tax10 | TurboTax 2010 Tax Return File | Uncommon |
| .tax11 | TurboTax 2011 Tax Return File | Uncommon |
| .tax2008 | TurboTax 2008 Tax Return | Average |
| .tax2009 | TurboTax 2009 Tax Return | Common |
| .tax2010 | TurboTax 2010 Tax Return | Very Common |
| .tax2011 | TurboTax 2011 Tax Return | Common |
| .tb | Tabbery Tab File | Average |
| .tbk | ToolBook File | Common |
| .tbl | StarCraft Information Table | Average |
| .tc | Tellico Collection File | Uncommon |
| .tcc | TimeCalc Classic Data File | Average |
| .tcx | Training Center Database File | Average |
| .tda | Palm To-Do File | Average |
| .tda | Java Application Thread Dump | Average |
| .tde | Tableau Data Extract File | Average |
| .tdl | Tab Delineated Format File | Uncommon |
| .tdm | LabVIEW Binary Measurement File | Average |
| .tdt | FirstBreak Concrete Test File | Uncommon |
| .tdt | THOR Data Tree File | Average |
| .te3 | WinTrack Object File | Average |
| .ted | TouchMagix Editable Document Template | Uncommon |
| .tef | TablEdit Tablature | Average |
| .tet | Textease CT Template | Average |
| .tfa | TreeSoft CashFlow Analysis Data File | Average |
| .tfd | Tape Format Requirements Document | Average |
| .tgf | Trivial Graph Format File | Average |
| .tjp | TaskJuggler Project File | Average |
| .tk3 | TK3 Multimedia eBook | Average |
| .tkfl | TKLinks Saver Favorite Links File | Average |
| .tl5 | Timeliner 5 File | Average |
| .tlx | Standard Dictionary File | Uncommon |
| .tmr | Apimac Timer Document | Uncommon |
| .tmw | Translation Memory Data File | Uncommon |
| .tmx | Translation Memory Exchange File | Common |
| .tol | AOL Tool File | Rare |
| .top | Gromacs Topology File | Uncommon |
| .topc | TopicCrunch Project File | Average |
| .tpb | GROMACS Binary Input File | Average |
| .tpf | Transit NXT Pack Translation File | Average |
| .tps | Multi Channel Measurement File | Average |
| .tpz | Kindle Topaz eBook File | Common |
| .tr3 | TomeRaider eBook File | Average |
| .tra | WinTrack Railroad Track File | Average |
| .trd | TrID Definitions Package | Average |
| .trk | CompeGPS Land Track File | Average |
| .trk | Garmin Track File | Rare |
| .trm | FTR Media File | Average |
| .trs | WinTrack Railroad Track Text File | Average |
| .trs | Rosetta Stone Language Data File | Common |
| .trx | WebAuthorize Batch File | Uncommon |
| .trx | Firmware Image File | Uncommon |
| .ts | Nokia Qt Translation Source File | Average |
| .tst | TestPoint Test File | Average |
| .tsv | Tab Separated Values File | Common |
| .tt10 | TurboTax Canada 2010 Tax Return | Common |
| .tt11 | TurboTax Canada 2011 Tax Return | Average |
| .ttk | Catalyst Translation Toolkit | Average |
| .twb | Tableau Workbook File | Common |
| .twbx | Tableau Packaged Workbook | Average |
| .txa | Midas ViewPoint Text Array List | Average |
| .txd | Game Texture Dictionary | Average |
| .txf | Tax Exchange Format | Average |
| .txf | Transit XV Pack Translation File | Uncommon |
| .txn | MySpaceIM Conversation Log File | Average |
| .ubj | Universal Binary JSON File | Uncommon |
| .uccapilog | Microsoft UCC API Log File | Common |
| .ud | OmniPage User Dictionary | Uncommon |
| .udc | Adobe InDesign User Dictionary | Average |
| .udeb | Debian Package File | Uncommon |
| .uds | Uniform Data System File | Rare |
| .uds | Sierra Generations File | Uncommon |
| .ulf | Universal List File | Average |
| .ulz | USBlyzer Data Capture File | Average |
| .umf | MediaHolder Universal Media Format File | Uncommon |
| .unitypackage | Unity Package File | Average |
| .update | ISAPI Update File | Uncommon |
| .upoi | iGO Points of Interest File | Average |
| .upr | FileMaker User Dictionary | Uncommon |
| .upr | Fractal Parameters File | Average |
| .ustar | Uniform Standard Tape Archive Format File | Rare |
| .uvf | Uncertain Value Format | Average |
| .uwl | User Word List File | Common |
| .val | Values List | Rare |
| .val | Valodas Dictionary File | Uncommon |
| .vault | Fontcase Vault File | Rare |
| .vbpf1 | Virtual Business - Personal Finance Data File | Average |
| .vbw | Visual Basic Workspace File | Average |
| .vcd | Value Change Dump File | Average |
| .vce | Visual CertExam Exam File | Average |
| .vcf | vCard File | Very Common |
| .vcs | vCalendar Event File | Average |
| .vct | VISE Installer Project | Uncommon |
| .vdb | Symantec Virus Database File | Common |
| .vdf | AntiVir Virus Definitions File | Average |
| .vdx | Visio Drawing XML File | Common |
| .vfs | VentaFax Schedule File | Rare |
| .vi | LabVIEW Virtual Instrument File | Average |
| .vip | Stitch Pattern File | Uncommon |
| .vle | Virtual Labs Electricity Circuit File | Rare |
| .vlg | VentaFax Logbook File | Rare |
| .vmsd | VMware Snapshot Metadata File | Uncommon |
| .vmsn | VMware Snapshot State File | Average |
| .vmss | VMware Suspended State File | Average |
| .vmt | Valve Material File | Average |
| .voi | VOI Group File | Average |
| .vok | PocketVok Vocabulary File | Average |
| .voxb | Voxler Network File | Average |
| .vpp | Visual Paradigm Project File | Average |
| .vpx | Avast! Virus Update File | Average |
| .vrd | Visio Report Definition File | Average |
| .vscontent | Visual Studio Content File | Average |
| .vsv | Virtual Machine Saved State File | Average |
| .vsx | Visio Stencil XML File | Average |
| .vtx | Visio Template XML File | Average |
| .vud | Virtual Machine Undo Drive File | Average |
| .vvf | Voc Vocabulary File | Rare |
| .vxml | VoiceXML File | Common |
| .w02 | Split Archive File | Rare |
| .wab | Windows Address Book | Common |
| .wb1 | Corel Quattro Pro File | Uncommon |
| .wb2 | Corel Quattro Pro File | Average |
| .wb3 | Corel Quattro Pro 7 and 8 File | Common |
| .wcat | WinCatalog Collection File | Average |
| .wcd | Works Calendar File | Average |
| .wdf | Workshare Compare DeltaFile | Common |
| .wdf | WinGenea Genealogy File | Rare |
| .wdq | Offline Explorer Queue File | Uncommon |
| .wea | Ecotect Weather File | Average |
| .wfm | dBASE Form | Uncommon |
| .wfm | Tektronix Waveform Data File | Average |
| .wgt | IMPS Data File | Average |
| .wgt | XNBC Synaptic Weights File | Average |
| .wid | SAP BusinessObjects Web Intelligence File | Average |
| .windowslivecontact | Windows Live Contacts File | Common |
| .wjr | ReGet Deluxe Data File | Average |
| .wk1 | Lotus Worksheet | Uncommon |
| .wk2 | Lotus 2 Worksheet | Rare |
| .wk3 | Lotus 3 Worksheet | Uncommon |
| .wk4 | Lotus 4 Worksheet | Uncommon |
| .wk5 | Lotus 5 Worksheet | Uncommon |
| .wke | Lotus 1-2-3 Educational Version Worksheet | Rare |
| .wnk | Wink Presentation | Average |
| .wpc | WordPad Converter File | Average |
| .wpc | Pazzles Cutting File | Uncommon |
| .wpf | WordPerfect Form | Uncommon |
| .wpk | GuinXell Package File | Rare |
| .wpo | HOLUX Waypoint File | Uncommon |
| .wpo | Technopress Waypoint 2D File | Rare |
| .wsi | Wise Package Studio Installer Package | Average |
| .wsm | Wise Package Studio Merge Module | Average |
| .wtb | Win-Test Binary Log File | Average |
| .wtr | Encarta File | Rare |
| .xaf | Affirm Deposition Transcript | Uncommon |
| .xappl | Spoon XML Application Configuration File | Average |
| .xas | Pro/ENGINEER Assembly Instance Accelerator File | Uncommon |
| .xbc | SMART Notebook File | Average |
| .xbk | SMART Notebook File | Uncommon |
| .xbt | SMART Notebook Template File | Uncommon |
| .xdb | Symantec Virus Database File | Common |
| .xdp | XML Data Package | Average |
| .xds | LcdStudio Design File | Uncommon |
| .xef | eManager Form Data | Average |
| .xem | PowerDesigner Model definition File | Average |
| .xer | Primavera P6 Project File | Average |
| .xfd | XFD File | Common |
| .xfd | FormFlow 99 Form Data File | Uncommon |
| .xfdf | Adobe Acrobat XFDF File | Common |
| .xfo | XSL-FO Formatted Form | Average |
| .xfr | iProcess Process Definition File | Uncommon |
| .xft | Adobe Form Designer 5.0 File | Average |
| .xgml | Graph Modeling Language XML File | Uncommon |
| .xgmml | XGMML Graph File | Uncommon |
| .xlc | Excel Chart | Average |
| .xlgc | ExpressK Database File | Uncommon |
| .xlt | Excel Template | Average |
| .xlw | Excel Workbook | Uncommon |
| .xmcd | Mathcad Worksheet File | Average |
| .xmi | XML Metadata Interchange File | Average |
| .xml | XML File | Very Common |
| .xmlper | LeCroy Binary Waveform File | Average |
| .xmpz | Miradi XML Project File | Rare |
| .xpdl | XPDL Module | Average |
| .xpg | Autoplay Media Studio Exported Page | Average |
| .xpj | RoboHelp HTML Project File | Common |
| .xpj | Micro Planner X-Pert Project File | Average |
| .xpm | Micro Planner Manager File | Uncommon |
| .xpr | SyncRO Soft oXygen XML Editor Project | Average |
| .xpt | SAS Transport File | Average |
| .xrp | RationalPlan Project File | Average |
| .xry | XRY Data File | Average |
| .xsl | XML Style Sheet | Common |
| .xslt | XSL Transformation File | Common |
| .xsn | InfoPath Form Template File | Uncommon |
| .xsvf | Xilinx Serial Vector Format File | Average |
| .xtg | Extensible TreeGraph File | Uncommon |
| .xtm | CmapTools Exported Topic Map | Uncommon |
| .xtm | Xtremsplit Data File | Average |
| .xtp | XTree Data File | Rare |
| .xvct | VISE XML Project File | Uncommon |
| .xxd | Brixx Planner Calendar | Rare |
| .xyz | Molecule Specification File | Uncommon |
| .xyz | Celestia Sampled Trajectory Data File | Uncommon |
| .xyzv | Celestia Sampled Trajectory File | Uncommon |
| .yam | Yahoo! Auctions Data | Rare |
| .ychat | Yahoo! Messenger Chat Log | Uncommon |
| .ygf | Y Graph Format File | Average |
| .zap | ZoneAlarm Pro Data File | Common |
| .zdb | EPSQ Database | Rare |
| .zdb | Quicken Online File | Rare |
| .zdb | Zimbra Database File | Average |
| .zdc | CD Catalog Expert Database File | Average |
| .zdct | Adobe Language File | Rare |
| .zix | Quicken Online File | Rare |
| .zmc | ZoneAlarm Quarantine File | Average |
| .zpl | Zoom Player Play List | Uncommon |
| .{pb | Corel WordPerfect Document Index File | Rare |
| .~hm | HostMonitor TestList Backup File | Uncommon |