| Erw. | Beschreibung |
| X | Stardent AVS X bitmap image (24bit)
|
| X | Lex language source code
|
| X | X1 archive
|
| X | Alysis SuperDisk self-extracting archive
|
| X | X-file animation (Direct3D) (DeepV2)
|
| X01 | Paradox secondary index
|
| X02 | Paradox secondary index
|
| X03 | Paradox secondary index
|
| X04 | Paradox secondary index
|
| X05 | Paradox secondary index
|
| X06 | Paradox secondary index
|
| X07 | Paradox secondary index
|
| X08 | Paradox secondary index
|
| X09 | Paradox secondary index
|
| X10 | Bitmap image (X Window dump)
|
| X11 | Bitmap image (X Windows system window dump), see .XWD
|
| X3D | x3d and xdart formats
|
| XAB | Addressbuch
|
| XAR | Corel XARa image
|
| XBM | X Windows system BitMap image (1bit text)
|
| XBW | Crossword
|
| XC | Bitmap image (Constant image of X server screen)
|
| XCK | Extended crack file (usually text)
|
| XCL | Xtree for Win script
|
| XDF | Extended disk format image (OS/2 xdfcopy.exe)
|
| XFN | Printer font (Xerox 4045) (Ventura Publisher)
|
| XFR | Ventura Publisher bitmap editor font file
|
| XFT | 24 pin printer font (ChiWriter)
|
| XGL | MegaBitz graphics language file
|
| XGZ | MegaBitz vector drawing
|
| XI | Fastracker 2.0 instrument file
|
| XIF | eXtended Image File Format
|
| XIM | Bitmap image (X11 Xim Toolkit file)
|
| XL | MS Excel spreadsheet
|
| XL* | MS eXceL spreadsheet
|
| XLA | MS eXceL Addin macro sheet
|
| XLA | Xlib Archive (Xlib graphics library)
|
| XLB | MS eXceL Spreadsheet
|
| XLC | MS eXceL Chart
|
| XLD | MS eXceL Dialog sheet
|
| XLK | MS eXceL Backup
|
| XLL | MS eXceL XLL add-in
|
| XLM | MS eXceL Macro
|
| XLS | MS eXceL spreadsheet
|
| XLT | MS eXceL Template
|
| XLT | Translation table (Lotus 123/Symphony/Procomm Plus)
|
| XLV | MS eXceL VBA module
|
| XLW | MS eXceL Workspace
|
| XM | Music (FastTracker/Cubic Player)
|
| XMI | Compressed eXtended MIdi music
|
| XML | XML document (Extensible Markup Language)
|
| XMZ | XGL movie (MegaView)
|
| XNF | Standard Network File form
|
| XNK | MS Exchange shortcut
|
| XOF | RenderMorphics
|
| XOS | Xaos Tools bitmap image
|
| XPIX | Nonogram puzzle
|
| XPM | X Windows system PixMap (256 color image for X Windows) (8bit text)
|
| XPS | Signatur / ASCII (Crosspoint)
|
| XQT | SuperCalc macro spreadsheet
|
| XQT | Waffle executable file
|
| XR1 | Epic MegaGames Xargon game data
|
| XREF | Cross reference (AIX as)
|
| XRF | Cross-Reference File
|
| XSC | XML schema
|
| XT | FastTracker music track
|
| XTB | LocoScript External Translation TaBle
|
| XTK | Parameter-Steuerfile (X-Talk)
|
| XTP | XTreeGold overlay
|
| XV | VIFF bitmap image (Khoros Visualization Image File Format)
|
| XWD | Bitmap image (X Windows window screen dump)
|
| XWK | Keyboard mapping (Crosstalk)
|
| XWP | Xerox Writer document
|
| XWP | Crosstalk session
|
| XX | XXEncoded file (ASCII) (xxdecode/xxencode), see .XXE
|
| XXE | XXEncoded file (ASCII) (xxencode)
|
| XY | XyWrite document
|
| XY3 | XY Write document
|
| XY4 | XY Write IV document
|
| XYP | XY Write III Plus document
|
| XYW | XY Write for Windows document |
