| Extension |
File Type |
File Description |
| .x | Developer | Lex Source Code File |
| .x32 | Plugin | Adobe Xtra File |
| .x3d | Image | Xara3D Project |
| .x64 | Disk | Commodore 64 Disk Image |
| .xa | Disk | GEAR CD/DVD Disc Image |
| .xaml | Developer | XAML File |
| .xap | Executable | Silverlight Application Package (Most common) |
| .xar | Vector Image | Xara Xtreme Drawing |
| .xbe | Game | Xbox Executable File |
| .xbm | Image | X11 Bitmap Graphic |
| .xcf | Raster Image | GIMP Image File |
| .xcode | Developer | Xcode Project |
| .xcodeproj | Developer | Xcode Project |
| .xdb | Data | PowerDesigner Database Definition File |
| .xdl | Text | XML Schema File (Most common) |
| .xdp | Data | XML Data Package |
| .xdw | Page Layout | Fuji Xerox DocuWorks File |
| .xef | Data | eManager Form Data (Most common) |
| .xem | Settings | eManager Metered Units (Most common) |
| .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 |
| .xfn | Font | Ventura Printer Font |
| .xfo | Data | XSL-FO Formatted Form |
| .xfs | Audio | eRacer Sound File |
| .xft | Data | Adobe Form Designer 5.0 File (Most common) |
| .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 | Image | ScanSoft Pagis File |
| .xl | Data | Excel Spreadsheet |
| .xla | Plugin | Excel Add-In File |
| .xlam | Plugin | Excel 2007 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 | Microsoft Works Spreadsheet |
| .xls | Data | Microsoft Excel Spreadsheet |
| .xlsb | Data | Excel Binary Workbook |
| .xlsm | Data | Excel 2007 Macro-Enabled Spreadsheet |
| .xlsx | Data | Microsoft Excel Open XML Document |
| .xlt | Data | Microsoft Excel Template |
| .xltm | Data | Excel 2007 Macro-Enabled Spreadsheet Template |
| .xltx | Data | Excel 2007 Spreadsheet Template |
| .xlv | Plugin | Excel Visual Basic Module |
| .xlw | Data | Microsoft Excel Workbook |
| .xm | Audio | Fasttracker 2 Extended Module |
| .xmb | Game | Age of Empires Game Data File (Most common) |
| .xmcd | Data | Mathcad Worksheet File |
| .xmcdz | Compressed | Mathcad Compressed Worksheet File |
| .xmd | Disk | GameJack Disc Image |
| .xmf | Audio | Extensible Music File (Most common) |
| .xmi | Audio | Extended MIDI File |
| .xml | Data | XML File |
| .xmlper | Data | LeCroy Binary Waveform File |
| .xmp | Misc | Extensible Metadata Platform File |
| .xnk | Misc | Exchange Shortcut |
| .xof | Image | Reality Lab 3D Image File |
| .xol | Misc | Swiss Map Overlay (Most common) |
| .xp | Audio | Fastracker 2 Pattern |
