Misc File Types
The Misc Files category contains miscellaneous file types that do not fit within other categories. Some examples are partially downloaded files, installer files, and renamed files. This category may also include files related to other hardware devices besides computers.
Common misc file extensions include .TORRENT, .PART, and .MSI.
| Extension | File Description | Popularity |
|---|---|---|
| .!bt | BitTorrent Incomplete Download File | Common |
| .!ut | uTorrent Incomplete Download | Average |
| .000 | Windows CE Installation Data File | Average |
| .1 | Unix Section 1 Man Page | Average |
| .3dc | RacerMate 3D Course File | Average |
| .83p | TI-83 Calculator File | Average |
| .8xp | TI-83 Plus Calculator File | Average |
| .aawdef | Ad-Aware Definitions File | Average |
| .abr | Adobe Photoshop Brushes File | Average |
| .ac$ | AutoCAD Temporary File | Average |
| .acb | AOL Cab Launcher | Uncommon |
| .acl | AutoCorrect List File | Average |
| .acs | Agent Character File | Average |
| .acsm | Adobe Content Server Message File | Common |
| .ad | After Dark Screensaver | Uncommon |
| .add | Dynamics AX Developer Documentation File | Average |
| .adi | Dynamics AX Developer Documentation Index File | Uncommon |
| .adm | Portfolio Admin-Level Access Flag | Uncommon |
| .afploc | Apple Filing Protocol Location | Average |
| .agd | Agile Advantage E-mail Attachment | Rare |
| .ahd | Dynamics AX Online Help Data File | Average |
| .ahi | Dynamics AX Online Help Index File | Average |
| .aif | Symbian Application Information File | Average |
| .aim | AOL Instant Messenger Launch File | Rare |
| .alt | Dynamics AX Temporary File | Average |
| .aml | Microsoft Assistance Markup Language File | Uncommon |
| .annot | Adobe Digital Editions Annotations File | Rare |
| .aod | Dynamics AX Object Data File | Average |
| .aoi | Dynamics AX Application Object Index File | Average |
| .aol | America Online File | Rare |
| .apf | Adobe Profile File | Average |
| .apnx | Amazon Page Number Index File | Average |
| .arr | Advanced RAR Password Recovery Project | Average |
| .ash | Nintendo Wii System Menu File | Rare |
| .ass | Aegisub Advanced Substation Alpha File | Average |
| .atz | Atomic Time Zone File | Rare |
| .auz | Ableton Authorization File | Average |
| .avastlic | Avast! License File | Common |
| .avgdx | AVG Diagnostics File | Average |
| .awc | Emulex AWC Firmware Update File | Rare |
| .awd | Award BIOS Update File | Rare |
| .awkw | Awkwords Word Generator File | Rare |
| .bbl | BibTeX Generated Bibliography File | Average |
| .bc | BitComet Partially Downloaded File | Average |
| .bc! | BitComet Incomplete File | Average |
| .bdr | Publisher Borders File | Average |
| .bfc | Windows Briefcase File | Average |
| .bkmk | Yummy FTP Bookmark File | Uncommon |
| .blf | MasterWorks Working File | Uncommon |
| .bmc | Embroidery Image File | Rare |
| .bmk | Nokia Device Bookmark File | Uncommon |
| .bnd | DB2 CLI Bind File | Uncommon |
| .bootskin | Stardock Bootskin File | Average |
| .bp2 | AutoCAD Batch Plot File | Average |
| .bp3 | AutoCAD Batch Plot File | Average |
| .bpl | AutoCAD Batch Plot File | Average |
| .bps | BPS Virus File | Uncommon |
| .bst | BibTeX Style Document | Average |
| .buf | Buffer File | Rare |
| .ca | Initial Telnet Cache | Rare |
| .cache | Cache File | Average |
| .calb | Coolect Album File | Rare |
| .cas | Autodesk Cascade License File | Average |
| .cbds | Comic Book DS File | Average |
| .cbt | Computer Based Training File | Uncommon |
| .ceb | Apabi eBook File | Average |
| .cfl | IMVU Product File | Average |
| .chk | Saved File Fragment | Average |
| .chw | Compiled Help Index File | Average |
| .cl | Cursor Library | Uncommon |
| .clkk | Clicker Keyboard | Average |
| .clkt | Clicker Template | Average |
| .clkw | Clicker Word Bank | Average |
| .clkx | Clicker Grid Set | Average |
| .clr | Flash Color Set | Average |
| .cls | LaTeX Document Class File | Common |
| .cmm | Corel Multimedia Manager Album | Uncommon |
| .contour | Contour Screenplay File | Average |
| .cos2 | Pinnacle Studio Cache File | Uncommon |
| .cp3 | Grand Prix 3 Cockpit Shape File | Average |
| .cpt | Pocket Slides Presentation | Rare |
| .crashed | AbiWord Crash-Saved Document | Uncommon |
| .crc | Total Commander Checksum File | Average |
| .crd | Windows CardSpace File | Common |
| .crd | Guitar Tabs | Uncommon |
| .csh | Photoshop Custom Shapes File | Common |
| .ctf | AVG Update Control File | Common |
| .ctf | Content Transformation File | Uncommon |
| .ctg | Canon Digital Camera Catalog File | Average |
| .cul | Windows Cursor Library | Average |
| .cvf | CPU-Z Validation File | Uncommon |
| .cvr | Microsoft Crash Report File | Average |
| .da2 | Ad-Aware License File | Uncommon |
| .dal | Download Accelerator Plus URL List | Average |
| .dap | Download Accelerator Plus Partial Download | Average |
| .dat | Exchange E-mail Attachment | Common |
| .db | Windows Thumbnail Cache | Common |
| .dbx | Outlook Express E-mail Folder | Very Common |
| .dc1 | Bloomba E-mail Message | Rare |
| .dcover | Disc Cover File | Average |
| .dct | Dictionary File | Average |
| .dctmp | DC++ Partially Downloaded File | Average |
| .dek | Memorize-It Flashcard Deck | Uncommon |
| .desktop | Desktop Entry File | Average |
| .dgc | TurboTax Tax Form | Rare |
| .dic | Dictionary File | Average |
| .diskdefines | Linux LiveCD Information File | Average |
| .dke | DriveLock FDE Disk Key File | Rare |
| .dlm | Akamai Download Manager File | Average |
| .dnl | DNAML eBook File | Average |
| .dpb | FaxMaster Document | Rare |
| .dr | DRM Rights Object | Average |
| .drc | DRM Rights Object | Average |
| .dsc | Nikon Disk Identification File | Average |
| .dskin | DockX Skin | Uncommon |
| .dstudio | DownloadStudio Incomplete Download | Average |
| .dtapart | DownThemAll! Partially Downloaded File | Average |
| .dtf | Domino Temporary File | Uncommon |
| .dt_ | Macintosh Data Fork | Rare |
| .dus | Readiris Font Dictionary | Average |
| .dwc | Emulex DWC Firmware Update File | Uncommon |
| .dwl | TurboCAD Drawing Lock File | Uncommon |
| .dwlibrary | Paperless Document Library | Average |
| .dwn | Firmware Update File | Uncommon |
| .ebk | eBook Pro eBook File | Average |
| .ebn | Philips Firmware Update File | Average |
| .edc | Kryptel Lite Encrypted File | Uncommon |
| .edn | Adobe eBook Activation File | Uncommon |
| .ef2 | Internet Download Manager Export File | Uncommon |
| .efl | External Format Language File | Uncommon |
| Outlook Express Email Message | Rare | |
| .enc | Encore Musical Notation File | Average |
| .eqn | WordPerfect Equation | Rare |
| .erl | GameGuard Error Log File | Uncommon |
| .err | AutoCAD Error Log File | Uncommon |
| .exd | Control Information Cache File | Average |
| .ext | Generic Email Attachment | Uncommon |
| .eyb | Microsoft Encarta Yearbook Update File | Uncommon |
| .ezlog | Skype Extras Manager Log File | Uncommon |
| .ezw | easyOFFER Real Estate Form File | Average |
| .fb! | FlashGet Incomplete Download File | Average |
| .fdr | Windows Error Report File | Average |
| .feedback | Expression SketchFlow Feedback File | Average |
| .ffl | Fetion Emoticons Package | Rare |
| .file | Generic Windows File | Average |
| .flf | Microsoft Dynamics NAV License File | Average |
| .fmelic | FME License File | Average |
| .fnd | Windows Saved Search | Uncommon |
| .fpfv | File Protected From Virus | Average |
| .fpk | JetForm FormFlow File | Rare |
| .frk | Macintosh Resource or Data Fork | Uncommon |
| .frm | Form File | Average |
| .frz | Locked FormFlow File | Uncommon |
| .ftil | e-Hastakshar Contract Note | Uncommon |
| .ftploc | FTP Location | Average |
| .fw | Firmware Update File | Average |
| .gau | Flight Simulator Gauge File | Average |
| .gg | Google Desktop Gadget File | Average |
| .gly | Word Glossary File | Uncommon |
| .gp4 | Guitar Pro 4 Tablature | Average |
| .gpg | GNU Privacy Guard Public Keyring | Uncommon |
| .growlregdict | Growl Temp File | Average |
| .gsp | Geometer's Sketchpad File | Uncommon |
| .h1q | Microsoft Help Merged Query Index File | Rare |
| .hdk | HotDocs Registration File | Uncommon |
| .hex | Hexadecimal Source File | Average |
| .hlb | VMS / VAX Help Library | Rare |
| .hlx | ATI Radeon Video Driver Support File | Average |
| .hmx | Help & Manual 4 Project | Average |
| .hs | Motorola Flash Flex File | Average |
| .hyp | Dictionary Information File | Uncommon |
| .ical | iCalendar File | Uncommon |
| .icalendar | iCalendar File | Uncommon |
| .icma | InCopy Assignment File | Average |
| .icontainer | CandyBar iContainer File | Uncommon |
| .ics | iCalendar File | Common |
| .id | Lotus Notes User ID File | Average |
| .idlk | Adobe InDesign Lock File | Average |
| .idx | Movie Subtitle File | Common |
| .ifl | 3ds Max Image File List | Average |
| .iix | Translation Memory Index File | Rare |
| .imapmbox | IMAP Mailbox | Average |
| .iml | ACT! Internet Mail Message | Uncommon |
| .imy | iMelody Ringtone File | Average |
| .in | Spyware File | Average |
| .inca | InCopy CS3 Assignment File | Average |
| .ind | Memory Stick Formatting File | Uncommon |
| .indk | Adobe InDesign Shortcut Set File | Uncommon |
| .inetloc | Internet Location | Average |
| .info | Texinfo Document | Uncommon |
| .info | Generic Information File | Average |
| .ing | MasterCook Ingredients File | Average |
| .inlk | Adobe InDesign Lock File | Average |
| .inm | FaxMaster Document | Rare |
| .ipsw | iPod and iPhone Software Update File | Average |
| .isn | Installer Source Files | Uncommon |
| .itc | iTunes Cover Flow Data File | Average |
| .iva | Dementia.4207 Virus File | Rare |
| .iws | InstallWatch Scan File | Rare |
| .jad | Java Application Descriptor File | Average |
| .jc | FlashGet Partial Download | Average |
| .jc! | FlashGet Incomplete Download | Average |
| .jrs | Exchange Reserve Transaction Log File | Uncommon |
| .key | LightWave License File | Average |
| .khd | Dynamics AX Kernel Help Data File | Average |
| .khi | Dynamics AX Kernel Help Index File | Average |
| .kyr | Lotus Domino Key Ring File | Average |
| .lay | DVD Studio Pro Layout File | Average |
| .lck | Program Lock File | Average |
| .ldb | Microsoft Access Lock File | Average |
| .lic | Software License File | Common |
| .lid | Kodak EasyShare Album File | Uncommon |
| .link | iPod Link File | Average |
| .linx | iPod Links Folder | Average |
| .lock | Lock File | Average |
| .logonvista | LogonStudio Windows Vista Logon Screen | Average |
| .logonxp | LogonStudio Windows XP Logon Screen | Average |
| .loov | Smadav Virus Definitions File | Average |
| .lrc | Lyrics File | Average |
| .ltf | Frogans Shortcut File | Average |
| .lwtp | LimeWire Theme Pack | Average |
| .lxa | Microsoft Speech Lexicon File | Average |
| .lyr | ArcView Layer File | Average |
| .mab | Mozilla Address Book | Average |
| .mad | Access Module Shortcut | Rare |
| .mag | Access Diagram Shortcut File | Uncommon |
| .mailplanelicense | Mailplane License File | Uncommon |
| .mailtoloc | Mail Internet Location File | Average |
| .manifest | Steam Manifest File | Uncommon |
| .map | TECkit Mapping File | Average |
| .mar | Mozilla Archive | Average |
| .mat | Microsoft Access Table Shortcut File | Uncommon |
| .mau | Media Attachment Unit | Rare |
| .mbb | Kodak EasyShare Data File | Average |
| .mbs | Opera Mailbox File | Average |
| .mc2 | MasterCook 5 Cookbook File | Average |
| .mcf | MasterCook 2 Cookbook File | Uncommon |
| .mcfi | Maya Initial Fluid Cache File | Uncommon |
| .mcfp | Maya Fluid Cache Playback File | Uncommon |
| .mci | Media Control Interface File | Rare |
| .mco | Live Messenger Winks File | Average |
| .md0 | Adobe Photoshop Metadata Cache File | Rare |
| .md5 | MD5 Checksum File | Common |
| .mdf | Translation Memory Data Find File | Average |
| .mdl | Flight Simulator Airplane Model | Average |
| .mdw | Access Workgroup File | Average |
| .merlinlicense | Merlin License File | Uncommon |
| .mgdatabase | MacGourmet Deluxe Database File | Average |
| .mgo | MacGourmet Recipe File | Average |
| .mgt | Musicnotes Guitar Guru Song File | Common |
| .mif | Management Information Format | Uncommon |
| .mjdoc | MacJournal Document | Average |
| .mls | CrystalPlayer Playlist | Average |
| .mmo | Memory Map Overlay File | Average |
| .mnl | AutoCAD Menu LISP File | Average |
| .mnx | FoxPro Menu | Average |
| .mobileprovision | Xcode Mobile Provisioning Profile | Average |
| .montage | Montage Screenplay File | Common |
| .mpcpl | Media Player Classic Playlist | Average |
| .mrk | DPOF Auto Print Order File | Average |
| .ms-tnef | MS Transport Neutral Encapsulation Format | Rare |
| .msf | Mail Summary File | Average |
| .msi | Windows Installer Package | Very Common |
| .mso | Inline E-mail Attachment | Common |
| .mso | Microsoft Office Macro Reference File | Average |
| .msrcincident | Windows Remote Assistance Invitation File | Average |
| .msu | Windows Vista Update Package | Average |
| .mta | Samsung AllShare Metadata File | Average |
| .mtd | Musicnotes Digital Sheet Music File | Common |
| .mtf | Translation Memory Translations File | Uncommon |
| .mtf | MasterCook Tips | Uncommon |
| .mvi | AutoCAD Movie Command File | Average |
| .mwf | Translation Memory Word Find File | Average |
| .mxn | Miinoto Exchangeable Note File | Uncommon |
| .mzz | Microsoft .NET Download Package | Uncommon |
| .na2 | Netscape Address Book File | Uncommon |
| .nav | MSN Application Extension File | Rare |
| .nav2 | WinAVI Temporary Navigation File | Average |
| .nch | Outlook Express Folder File | Average |
| .ncw | Nero CoverDesigner Wizard File | Uncommon |
| .ncx | EPUB Navigation Control XML File | Average |
| .nd5 | Renamed NDS File | Rare |
| .ndl | Lotus Notes Doclink File | Average |
| .nfs | Network File System Temporary File | Average |
| .nick | Outlook 2000 Nickname File | Average |
| .njb | Nikon Photo Index File | Average |
| .nk2 | Outlook 2002 Nickname File | Average |
| .nss | Magnetic Screensaver File | Average |
| .ntf | MediaFACE II CD Label File | Uncommon |
| .nth | Nokia Series 40 Theme File | Average |
| .nup | Smart Security Update File | Uncommon |
| .nwm | Sony NWM Display Screen File | Average |
| .nwp | Magnetic Wallpaper File | Average |
| .ob! | Orbit Downloader Incomplete Download | Average |
| .odf | OpenDocument Formula | Average |
| .ods | Outlook Express 5 Mailbox | Uncommon |
| .ofr | SMS Offer Manager File | Rare |
| .olb | OLE Object Library | Average |
| .opf | Open Packaging Format File | Average |
| .opf | FlipAlbum File | Uncommon |
| .ost | Outlook Offline Folder File | Average |
| .otc | OpenDocument Chart Template | Uncommon |
| .otf | OpenDocument Formula Template | Uncommon |
| .owg | OutWit Gear Database | Uncommon |
| .owm | OutWit XML Mashup File | Uncommon |
| .p10 | Certificate Request File | Average |
| .p2p | FolderShare Placeholder File | Average |
| .p7m | Digitally Encrypted Message | Average |
| .p7r | Certificate Request Response File | Average |
| .pad | ACT! Database Pointer File | Average |
| .pakm | PAKM Package File | Rare |
| .pando | Pando File | Average |
| .pap | Corel Painter Paper Texture | Rare |
| .part | Partially Downloaded File | Very Common |
| .partial | Internet Explorer Partially Downloaded File | Common |
| .pef | PEF Braille Book File | Uncommon |
| .pes | Brother Embroidery Format | Average |
| .pgp | PGP Security Key | Common |
| .phl | Kindle Popular Highlights File | Average |
| .pid | Process ID File | Uncommon |
| .pla | iriver iQuickList File | Average |
| .playset | Souptoys Playset File | Average |
| .plf | Papyrus License File | Uncommon |
| .plsk | Messenger Plus! Live Skin Pack | Average |
| .ppf | Paint Shop Pro Soft Plastic Preset File | Rare |
| .ppk | PuTTY Private Key File | Average |
| .ppm_b | Nokia PPM Flash File | Rare |
| .prs | PlayStation Radio Player Location | Rare |
| .psar | PSP Update File | Average |
| .psf | HP-UX Product Specification File | Uncommon |
| .psi | PrimalScript Online Help Shortcut | Average |
| .pss | Picture and Sound Show File | Rare |
| .psw | Windows Password Reset Disk File | Average |
| .pt | Panther Project File | Rare |
| .pth | 4D Path Document | Average |
| .ptr | Desktop Flash Intro Project File | Average |
| .pvk | Private Key File | Average |
| .pvm | HP Photo Album | Uncommon |
| .pwrep | Password Repository File | Average |
| .qds | Windows Directory Query File | Uncommon |
| .qua | Avira AntiVir Quarantined File | Uncommon |
| .qxl | QuarkXPress Library | Average |
| .raskinlicense | Raskin License File | Uncommon |
| .rat | PICS Rating File | Average |
| .rem | BlackBerry Encrypted Data File | Average |
| .req | Canon SD Card Version Request File | Uncommon |
| .req | SSL Certificate Request File | Average |
| .rfb | RoboForm Bookmark File | Uncommon |
| .rfc | RoboForm Contact File | Uncommon |
| .rfn | RoboForm Safenote File | Average |
| .rfp | RoboForm Passcard File | Average |
| .rft | RoboForm Identity File | Uncommon |
| .rjs | RealJukebox Skin File | Average |
| .rml | Elixir Report Template File | Uncommon |
| .rnd | PGP Random Seed File | Average |
| .rnd | Random Hash Data File | Average |
| .rom | Read Only Memory Image | Average |
| .rov | Report Object Variable | Uncommon |
| .rpmsg | Outlook Restricted Permission Message | Average |
| .rsa | RSA Certificate File | Average |
| .rtc | Live Meeting Connection File | Average |
| .rtm | LabVIEW Run-Time Menu File | Uncommon |
| .rtp | TurboTax Update File | Rare |
| .rwlibrary | Paperless Receipt Library | Average |
| .rwz | Outlook Rules Wizard File | Common |
| .rxc | Roxio Certificate File | Uncommon |
| .sbc | Office Accounting Company Shortcut File | Average |
| .sbk | Multimedia ToolBook System Book | Rare |
| .sc2locale | Blizzard StarCraft 2 Localization File | Uncommon |
| .scw | Score Writer Document | Average |
| .search-ms | Windows Saved Search File | Average |
| .sec | PGP Secret Key Ring | Average |
| .sfv | Simple File Verification File | Average |
| .sha256 | FileVerifier++ SHA-256 Hashes File | Rare |
| .shortcut | Asutype Shortcut | Uncommon |
| .shs | Microsoft Scrap File | Uncommon |
| .shv | Husqvarna Viking Embroidery File | Uncommon |
| .shx | Motorola Flash Superfile | Average |
| .sis | Symbian Installation File | Common |
| .sis.dm | Ovi Store DRM-Protected Application | Common |
| .sisx | Symbian OS Installation File | Average |
| .sisx.dm | Nokia Ovi Store DRM-Protected Application | Common |
| .skindex | Mail Index File | Average |
| .skr | PGP Private Keyring | Average |
| .slb | AutoCAD Slide Library | Uncommon |
| .slf | Symantec License File | Average |
| .slupkg-ms | XrML Digital License Package | Average |
| .smrd | Adobe InDesign Filter File | Uncommon |
| .smwt | Adobe InDesign Filter | Uncommon |
| .snm | Netscape Mail Index | Uncommon |
| .snt | Sticky Notes File | Average |
| .spk | Synology Package | Average |
| .sr0 | SecuROM Analysis File | Average |
| .ssc | Stellarium Script | Uncommon |
| .ssd | WindowBlinds Skin File List | Average |
| .sslf | HLSW Shared Server List File | Average |
| .sst | Serialized Certificate Store File | Uncommon |
| .ssw | Sony Ericsson Firmware File | Average |
| .std | CD/DVD Label Template | Rare |
| .sth | Lotus Domino Stash File | Average |
| .stmb | Synclavier Timbre File | Average |
| .storymill | StoryMill Project File | Common |
| .sum | Garmin Checksum File | Uncommon |
| .svn-work | Subversion Cache File | Average |
| .swj | SolidWorks Journal File | Average |
| .swp | Vi Swap File | Average |
| .sxm | StarMath Formula | Uncommon |
| .t$m | AVG Internet Security Temporary File | Uncommon |
| .tag | DataFlex Query Tag | Average |
| .tbs | TuneUp Utilities Boot Screen | Average |
| .tcr | Psion Series 3 eBook File | Average |
| .tcr | TouchMagix Creative Suite Published File | Uncommon |
| .td | Thunder Incomplete Download File | Average |
| .tdl | MathType Translator Definition Language | Average |
| .tec | TECkit Compiled Mapping File | Average |
| .temp | Temporary (Temp) File | Average |
| .thm | Sony Ericsson Theme File | Average |
| .tip | TuneUp Utilities Icon Package | Average |
| .tko | Win32/Oficla Trojan File | Rare |
| .tla | TuneUp Utilities Startup Logo | Uncommon |
| .tlb | OLE Type Library | Average |
| .tls | TuneUp Utilities Logon Screen | Average |
| .tmb | Timbuktu Pro Connection Document | Uncommon |
| .tmpl | Xfire User Interface Template | Rare |
| .tnef | Transport Neutral Encapsulation Format | Uncommon |
| .toc | Eudora Table of Contents | Common |
| .torrent | BitTorrent File | Very Common |
| .tpl | Document Template | Average |
| .tpm | Transformation Parameters Model File | Average |
| .tpm | Trusted Platform Module Password File | Average |
| .tps | Clarion TopSpeed Data File | Average |
| .tstream | SwarmPlayer Streaming Torrent | Average |
| .ttx | Trados TagEditor File | Average |
| .tvl | TurboTax File | Rare |
| .uds | NetBackup UNIX Domain Socket File | Rare |
| .uls | NetMeeting User Location Service File | Average |
| .unk | Unknown File | Rare |
| .unknown | Unknown File Type | Average |
| .unl | Garmin Unlock File | Uncommon |
| .urr | Uniface Signatures File | Rare |
| .vbt | Spyware Doctor Temporary Scan File | Common |
| .vbt | iAntiVirus Temporary Scan File | Average |
| .vdi | StepMania Debug Resource File | Rare |
| .ver | Version Record | Rare |
| .vfs | Virtual File System Index | Average |
| .vir | Virus-Infected File | Average |
| .vlcl | VMware Localization File | Rare |
| .vmf_autosave | Valve Hammer Editor Autosave File | Uncommon |
| .vmg | Nokia Text Message | Average |
| .vmhf | VMware Hot Fix File | Uncommon |
| .vmhr | VMware Hot Fix Request File | Uncommon |
| .vmsg | VMware Application Message File | Rare |
| .vncloc | Screen Sharing VNC Internet Location | Average |
| .vol | Volfs File System Directory | Average |
| .vor | StarOffice Template | Average |
| .vpa | VPchat Chat Gestures File | Average |
| .vpc7 | Virtual Machine Package | Average |
| .vs | Vivid Include File | Rare |
| .wal | Winamp Modern Skin | Average |
| .wba | WindowBlinds Compressed Skin | Average |
| .wcm | Microsoft Works Communications Script | Uncommon |
| .wgs | Walk-Graph Segment File | Rare |
| .wje | WinJournal Entry | Average |
| .wjf | WinJournal Journal File | Uncommon |
| .wlx | Windows Live Mesh Sync File | Common |
| .wordlist | Desktop Poet Word List File | Average |
| .wsz | Winamp Classic Skin | Average |
| .wtc | Logitech Webcam File | Average |
| .wwd | Works Wizard File | Average |
| .wzmul | WinZip Registration File | Average |
| .xcarchive | Xcode Archive | Average |
| .xlnk | XML Shortcut File | Average |
| .xlw | Excel Workspace File | Average |
| .xmp | Extensible Metadata Platform File | Average |
| .xnk | Exchange Shortcut | Average |
| .xol | PowerDesigner Object Language File | Average |
| .xpr | PressIt Disc Label | Uncommon |
| .xslic | XenServer License File | Average |
| .xwf | OmniPage Workflow File | Average |
| .xxx | Compucon Singer Embroidery File | Uncommon |
| .ybd | YobiDrive Link File | Uncommon |
| .ybk | YanCEyWare eBook | Average |
| .ybk | Microsoft Encarta Yearbook File | Uncommon |
| .ymg | Yahoo! Messenger File | Rare |
| .yps | Yahoo! Messenger Data File | Uncommon |
| .z1 | ZoneAlarm Renamed VB File | Rare |
| .zm1 | ZoneAlarm Renamed MDA File | Average |
| .zm2 | ZoneAlarm Renamed MDZ File | Average |
| .zm3 | ZoneAlarm Renamed NCH File | Average |
| .zm9 | ZoneAlarm MailSafe Renamed Zip File | Uncommon |
| .zml | Zooming Markup Language File | Average |
| .ztf | DVD Label Template File | Average |
| .ztr | DVD Label Template Media File | Average |
| .zvpl | Visual Paradigm License File | Average |
| ._eml | Windows Live Mail Email File | Average |
| ._nws | Windows Live Mail Newsgroup Copy File | Uncommon |