| 1. | X | Stardent AVS X bitmap image (24bit), see .AVS Lex language source code X1 archive Alysis SuperDisk self-extracting archive X-file animation (Direct3D) (DeepV2) |
| 2. | X01 | |
| 3. | X02 | |
| 4. | X03 | |
| 5. | X04 | |
| 6. | X05 | |
| 7. | X06 | |
| 8. | X07 | |
| 9. | X08 | |
| 10. | X09 | |
| 11. | X10 | Bitmap image (X Window dump) |
| 12. | X11 | Bitmap image (X Windows system window dump), see .XWD |
| 13. | X3D | |
| 14. | XAR | |
| 15. | XBM | X Windows system BitMap image (1bit text) |
| 16. | XBW | |
| 17. | XC | Bitmap image (Constant image of X server screen) |
| 18. | XCK | Extended crack file (usually text) |
| 19. | XCL | |
| 20. | XDF | Extended disk format image (OS/2 xdfcopy.exe) |