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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .X13 | DarXabre | Game Files | Hooligans Game Archive File | Dragon UnPACKer | Open Source |
| .X64 | Commodore International | Disk Image Files | Commodore 64 Disk Image | VICE | Open Source |
| .XA | Electronic Arts | Audio Files | The Sims Audio File | PSMplay | Open Source |
| .XA2 | Csabo | Game Files | XWE Data File | XWE | Open Source |
| .XAC | Tilted Mill Entertainment | Game Files | SimCity Societies Game File | GnuCash | Open Source |
| .XAF | Autodesk, Inc. | 3D Image Files | 3ds Max XML Animation File | Cal3DViewer | Open Source |
| .XAR | Magix Software GmbH | Vector Image Files | Xara Xtreme Drawing | Xara Xtreme for Linux | Open Source |
| .XBEL | Python Software Foundation | Web Files | XBEL Bookmarks File | Arora | Open Source |
| .XBL | Open Source | Developer Files | XBLite Source Code File | XBLite | Open Source |
| .XBM | Unknown Developer | Raster Image Files | X11 Bitmap Graphic | IrfanView | Open Source |
| .XCF | Gimpel Software | Raster Image Files | GIMP Image File | IrfanView | Open Source |
| .XDC | Adobe Systems Incorporated | Settings Files | Adobe Acrobat Printer Description | DarkCrypt IV | Open Source |
| .XDELTA | Open Source | Compressed Files | Xdelta Binary Differential File | xdelta | Open Source |
| .XDF | NASA | Disk Image Files | Extended Disk Format Image | TunerPro | Open Source |
| .XEN | Activision | Game Files | Guitar Hero 3 Data File | Xenu's Link Sleuth | Open Source |
| .XGP | Open Source | Data Files | Xfire Game Patcher File | XGP | Open Source |
| .XHD | Open Source | Uncommon Files | HappyFish XML Data File | HappyFish | Open Source |
| .XI | Starbreeze Studios | Audio Files | Fasttracker 2 Extended Instrument File | MilkyTracker | Open Source |
| .XKM | Open Source | Data Files | X KeyBoard File | Linux | Open Source |
| .XL | Microsoft Corporation | Spreadsheet Files | Excel Spreadsheet | XBLite | Open Source |
| .XLF | Open Source | Data Files | XLIFF Document | OmegaT | Open Source |
| .XLS | Microsoft Corporation | Spreadsheet Files | Microsoft Excel 97 To 2003 Spreadsheet | Gnumeric | Open Source |
| .XM | Starbreeze Studios | Audio Files | FastTracker 2 Extended Module | ModPlug Player | Open Source |
| .XMCD | Parametric Technology Corporation | Data Files | Mathcad Worksheet File | SMath Studio | Open Source |
| .XMF | Open Source | 3D Image Files | Cal3D XML Mesh File | Cal3DViewer | Open Source |
| .XML | Wattle Software | Data Files | XML File | AbiWord | Open Source |
| .XMZ | Starbreeze Studios | Audio Files | FastTracker 2 Extended Module | ModPlug Player | Open Source |
| .XP3 | Open Source | Game Files | KiriKiri Package File | XP3 / Kirikiri tools | Open Source |
| .XPF | Open Source | Audio Files | Linux MultiMedia Studio Preset File | LMMS | Open Source |
| .XPM | XnSoft | Raster Image Files | X11 Pixmap Graphic | IrfanView | Open Source |
| .XPY | Open Source | Settings Files | XPY Settings File | XPY | Open Source |
| .XQL | Open Source | Developer Files | XML Query Language File | MacVim | Open Source |
| .XR | Red Hat | Developer Files | Cygwin Ld-scripts Data | Cygwin | Open Source |
| .XR2 | Open Source | Data Files | Xrecode II Registration | Xrecode | Open Source |
| .XRF | Open Source | 3D Image Files | Cal3D XML Materials File | Cal3DViewer | Open Source |
| .XRL | SAP | Data Files | PowerDesigner Report File | XML Résumé Library | Open Source |
| .XS3 | Open Source | Spreadsheet Files | XESS Worksheet | Xess | Open Source |
| .XS4 | Open Source | Spreadsheet Files | XESS Worksheet | Xess | Open Source |
| .XS5 | Open Source | Spreadsheet Files | XESS Worksheet | Xess | Open Source |
| .XSF | Microsoft Corporation | Data Files | InfoPath Form Definition File | Cal3DViewer | Open Source |
| .XSP | Open Source | Audio Files | Kodi Smart Playlist File | Kodi | Open Source |
| .XSPF | VideoLAN | Audio Files | XSPF Playlist File | Clementine | Open Source |
| .XVG | Open Source | Text Files | Grace Document | GRACE | Open Source |
| .XVID | DivX, LLC. | Video Files | Xvid-Encoded Video File | Eltima Elmedia Player | Open Source |
| .XVO | Open Source | Data Files | RatDVD Internal File | RatDVD | Open Source |
| .XYZ | SourceForge | Data Files | Molecule Specification File | Avogadro | Open Source |
| .XZ | Various Developers | Compressed Files | XZ Compressed Archive | ExtractNow | Open Source |
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