List of Data File Formats Starting with the Letter "X"
| .x | DirectX Object file |
| AVS X image file (SDSC Image Tool) | |
| Lex source code file | |
| .x01 | Secondary index (Paradox) |
| .x02 | Secondary index (Paradox) |
| .x03 | Secondary index (Paradox) |
| .x04 | Secondary index (Paradox) |
| .x05 | Secondary index (Paradox) |
| .x06 | Secondary index (Paradox) |
| .x07 | Secondary index (Paradox) |
| .x08 | Secondary index (Paradox) |
| .x09 | Secondary index (Paradox) |
| .x16 | Macromedia Program Extension (16-bit) |
| .x32 | Macromedia Program Extension (32-bit) |
| .xap | Silveright Application Package |
| .xbel | XML Bookmark Exchange Language file |
| .xbm | X11 Bitmap graphics |
| .xcf | Gimp Image file |
| .xdf | Milnta APL Transfer Function |
| Workshare Synergy file | |
| .xdw | X Windows Screen Dump file |
| .xef | X-Genics eManager - XML form and data for eManager |
| .xem | X-Genics eManager - Metered units / credit definition for forms/file usage in eManager |
| .xep | X-Genics eManager - File packaging / unpacking information for eManager components |
| .xes | X-Genics eManager - XML definition for UI skins |
| .xet | X-Genics eManager - XML definition for eManager process |
| .xev | X-Genics eManager - File download definition for auto-update and delivery of new procedures |
| .xez | X-Genics eManager - Template package for eManager |
| .xfd | XML Form in XFDL Format |
| .xfdl | Extensible Forms Description Language file |
| .xfn | Printer font (Xerox 4045) (Ventura Publisher) |
| .xft | 24 pin printer font (ChiWriter) |
| .xfx | Fax File (various) |
| .xhtml | Extensible HyperText Markup Language file |
| .xi | Fast Tracker 2 Instrument or ScreamTracker Instrument file |
| .xif | Wang image file |
| Often a Fax image (TIFF) file | |
| ScanSoft Pagis XIF Extended Image Format | |
| Xerox image file | |
| .xla | Xlib Archive (xlibpas2.zip) |
| .xla | Add-in macro sheet (MS Excel) |
| .xlb | Data (MS Excel) |
| .xlc | Chart document (MS Excel) |
| .xlk | Excel Backup |
| .xll | Excel Dynamic Link Library (MS Excel) |
| .xlm | Macro sheet (MS Excel) |
| .xlr | MS Works file |
| .xls | Spreadsheet(MS Works) |
| DATAIR Data Import Specification Translation file | |
| Worksheet (MS Excel) | |
| .xlsm | Microsoft Excel Macro-Enabled Workbook file |
| .xlsx | Microsoft Excel XML file |
| .xlt | Template (MS Excel) |
| Translation table (Lotus 1-2-3 - Symphony - Procomm Plus) | |
| .xlw | Workbook (MS Excel) |
| .xlx | XoloX Incomplete Download file |
| .xm | Music (Fast Tracker) |
| .xmi | Compressed eXtended MIdi music |
| .xml | Extensible Markup Language file |
| .xmp | Extensible Metadata Platform |
| .xnf | Standard Network File form |
| .xpi | XPInstall File |
| Digital surveillance system | |
| .xnk | Microsoft Exchange Shortcut |
| .xpl | Music file |
| .xpm | X11 Pixel Map graphics |
| .xpr | Memorex CD-ROM label file |
| .xps | XML Paper Specification file |
| .xpt | Mozilla Firefox Component file |
| XPCOM Type Library | |
| .xpw | Leading Market Technologies EXPO |
| Screen-Fillable Surfer Version of a Form | |
| .xqt | Executable file (Waffle) |
| Macro sheet (SuperCalc) | |
| .xpv | digital surveillance system |
| .xrf | Cross-reference file |
| .xsd | XML Schema file |
| .xsf | Milnta APL Transfer Function |
| .xsl | Extensible Stylesheet Language file |
| .xspf | XML Shareable Playlist file |
| .xss | Ability Office Spreadsheet |
| .xtb | External translation table (LocoScript) |
| .xtm | Xtremsplit Data file |
| .xtr | MapTool file (an add-on for UI-View) |
| Xtreme Tuning files | |
| .xul | XML User Interface Language file |
| .xvb | WinExplorer VB Script |
| .xvid | Xvid Video file |
| .xvl | Compact 3D file format for web apps.(Lattice 3D) |
| .xwd | X Window System window dump image graphics (SDSC Image Tool) |
| .xwk | Keyboard mapping (Crosstalk) |
| .xwp | Session (Crosstalk) |
| Text file (Xerox Writer) | |
| .xx | Compressed file ASCII archive created by XXENCODE (uuexe515.exe) |
| .xxe | Compressed file ASCII archive created by XXENCODE (uuexe515.exe) |
| .xxx | Singer Sewing Machine Professional SewWare file |
| Embroidery Design file | |
| .xy | Text file (XY Write) |
| .xy3 | Text file (XYWrite III) |
| .xyw | Text file (XyWrite III) |
| .xyz | ASCII RPG Maker Graphic Format |
| .xz | XZ Compressed Archive file |
