| Extension |
File Type |
File Description |
| .x | Developer | Lex Source Code File |
| .x32 | Plugin | Adobe Xtra File |
| .x3d | 3D Image | Xara3D Project |
| .x4k | Settings | XML4King Configuration File |
| .x64 | Disk | Commodore 64 Disk Image |
| .xa | Disk | GEAR CD/DVD Disc Image |
| .xa | Audio | The Sims Audio File |
| .xa | Audio | PlayStation Audio File |
| .xaml | Developer | XAML File |
| .xap | Executable | Silverlight Application Package |
| .xap | Developer | XACT Project |
| .xar | Vector Image | Xara Xtreme Drawing |
| .xas | Data | Pro/ENGINEER Assembly Instance Accelerator File |
| .xbe | Game | Xbox Executable File |
| .xbk | Data | SMART Notebook File |
| .xbm | Raster Image | X11 Bitmap Graphic |
| .xbsav | Game | Mass Effect 2 Xbox Saved Game |
| .xcf | Raster Image | GIMP Image File |
| .xcode | Developer | Xcode Project |
| .xcodeproj | Developer | Xcode Project |
| .xcu | Settings | OpenOffice.org Configuration File |
| .xdb | Data | Symantec Virus Database File |
| .xdb | Data | PowerDesigner Database Definition File |
| .xdl | Text | Oracle Expert Definition Language File |
| .xdl | Text | XML Schema File |
| .xdp | Data | XML Data Package |
| .xdr | Settings | XML-Data Reduced File |
| .xds | Game | DS Game Maker Project File |
| .xds | Data | LcdStudio Design File |
| .xdw | Page Layout | Fuji Xerox DocuWorks File |
| .xef | Compressed | WinAce Encrypted File |
| .xef | Data | eManager Form Data |
| .xem | Data | PowerDesigner Model definition File |
| .xem | Settings | eManager Metered Units |
| .xen | Game | Guitar Hero III Data File |
| .xep | Settings | eManager File Packaging Information |
| .xes | Settings | eManager Skins Definition |
| .xet | Settings | eManager Process Definition |
| .xev | Settings | eManager Auto-Update File |
| .xex | Game | Xbox 360 Executable File |
| .xez | Compressed | eManager Template Package |
| .xfd | Data | XFD File |
| .xfdl | Web | XFDL File |
| .xfl | Video | Flash Movie Archive |
| .xfn | Font | Ventura Printer Font |
| .xfo | Data | XSL-FO Formatted Form |
| .xfs | Audio | eRacer Sound File |
| .xft | Data | Adobe Form Designer 5.0 File |
| .xft | Font | ChiWriter Printer Font |
| .xgs | Settings | XACT Global Settings File |
| .xht | Web | XHTML File |
| .xhtml | Web | Extensible Hypertext Markup Language File |
| .xi | Audio | Fasttracker 2 Extended Instrument File |
| .xib | Developer | Interface Builder File |
| .xif | Page Layout | ScanSoft Pagis File |
| .xl | Data | Excel Spreadsheet |
| .xla | Plugin | Excel Add-In File |
| .xlam | Plugin | Excel Open XML Macro-Enabled Add-In |
| .xlb | Settings | Excel Toolbars File |
| .xlc | Data | Excel Chart |
| .xlf | Text | XLIFF Document |
| .xlgc | Data | ExpressK Database File |
| .xlk | Backup | Excel Backup File |
| .xll | Plugin | Excel Add-In File |
| .xlm | Misc | Excel Macro |
| .xlnk | Misc | XML Shortcut File |
| .xlr | Data | Works Spreadsheet |
| .xls | Data | Excel Spreadsheet |
| .xlsb | Data | Excel Binary Spreadsheet |
| .xlsm | Data | Excel Open XML Macro-Enabled Spreadsheet |
| .xlsx | Data | Microsoft Excel Open XML Spreadsheet |
| .xlt | Data | Excel Template |
| .xltm | Data | Excel Open XML Macro-Enabled Spreadsheet Template |
| .xltx | Data | Excel Open XML Spreadsheet Template |
| .xlv | Plugin | Excel Visual Basic Module |
| .xlw | Misc | Excel Workspace File |
| .xlw | Data | Excel Workbook |
| .xm | Audio | Fasttracker 2 Extended Module |
| .xmb | Game | Age of Empires Game Data File |
| .xmb | Game | X-Wing Mission Briefing File |
| .xmcd | Data | Mathcad Worksheet File |
| .xmcdz | Compressed | Mathcad Compressed Worksheet File |
| .xmd | Disk | GameJack Disc Image |
| .xmf | Disk | GameJack Disc Image File |
| .xmf | Audio | Extensible Music File |
| .xmi | Audio | Extended MIDI File |
| .xml | Data | XML File |
| .xmlper | Data | LeCroy Binary Waveform File |
| .xmp | Misc | Extensible Metadata Platform File |
| .xmpz | Data | Miradi XML Project File |
| .xmz | Audio | FastTracker 2 Extended Module |
| .xnk | Misc | Exchange Shortcut |
| .xof | 3D Image | Reality Lab 3D Image File |
| .xol | Misc | PowerDesigner Object Language File |
| .xol | GIS | Swiss Map Overlay |
| .xom | Game | Worms 3D Object File |
| .xoml | Developer | Windows Workflow File |
| .xp | Audio | Fastracker 2 Pattern |
| .xpaddercontroller | Settings | Xpadder Controller Profile |
| .xpd | Web | XML Pipeline Document |
| .xpd | Game | PlayStation Store PSP License File |
| .xpg | Data | Autoplay Media Studio Exported Page |
| .xpi | Compressed | Mozilla Installer Package |
| .xpj | Data | Micro Planner X-Pert Project File |
| .xpk | Game | WWE RAW Model File |
| .xpl | Settings | LcdStudio Playlist File |
| .xpm | Raster Image | X11 Pixmap Graphic |
| .xpm | Data | Micro Planner Manager File |
| .xpr | 3D Image | Pro/ENGINEER Part Instance Accelerator File |
| .xpr | Misc | PressIt Disc Label |
| .xps | Page Layout | XML Paper Specification File |
| .xpt | Data | SAS Transport File |
| .xpt | Plugin | Mozilla Firefox Component |
| .xqt | Executable | SuperCalc Macro File |
| .xrm-ms | System | Microsoft Security Certificate |
| .xrns | Audio | Renoise Song File |
| .xrp | Data | RationalPlan Project File |
| .xry | Data | XRY Data File |
| .xs | Game | Age of Empires 3 Map AI Generator |
| .xsb | Audio | XACT Sound Bank |
| .xsd | Developer | XML Schema Definition |
| .xsi | 3D Image | Softimage XSI 3D Image |
| .xsl | Data | XML Style Sheet |
| .xslt | Data | XSL Transformation |
| .xsn | Data | InfoPath Form Template File |
| .xspf | Audio | XSPF Playlist File |
| .xst | Settings | WebSphere Query Template |
| .xt | Audio | Fastracker 2 Track |
| .xt | Developer | Xdebug Trace File |
| .xtl | Game | Vietcong Data File |
| .xtm | Data | Xtremsplit Data File |
| .xtm | Data | CmapTools Exported Topic Map |
| .xtp | Data | XTree Data File |
| .xtreme | Settings | Winstep Xtreme Theme Pack |
| .xul | Web | XML User Interface Language File |
| .xv0 | 3D Image | Lattice XVL Structure File |
| .xv3 | CAD | Lattice XVL Geometry File |
| .xvid | Video | Xvid-Encoded Video File |
| .xwb | Audio | XACT Wave Bank |
| .xwd | Raster Image | X Windows Dump Image |
| .xwf | Misc | OmniPage Workflow File |
| .xwk | Settings | Crosstalk Communicator Keyboard Mapping File |
| .xwp | Text | Crosstalk Session File |
| .xwp | Text | XMLwriter Project |
| .xwp | Text | Xerox Writer Text Document |
| .xws | Web | Xara Web Designer Graphic |
| .xx | Compressed | XXEncoded File |
| .xxd | Data | Brixx Planner Calendar |
| .xxe | Encoded | XXEncoded File |
| .xxx | Misc | Compucon Singer Embroidery File |
| .xy | Text | XYWrite Document |
| .xy3 | Text | XYWrite III Document |
| .xyp | Text | XYWrite Plus Document |
| .xys | Executable | XYplorer Script File |
| .xyw | Text | XYWrite for Windows Document |
| .xyz | Data | Molecule Specification File |
| .xz | Compressed | XZ Compressed Archive |
| .xzfx | Page Layout | ZipLogix ZipForm File |
| .x_b | CAD | Parasolid Model Part File |
| .x_t | CAD | Parasolid Model Part File |
