| Extension | File Description |
| .XYC | Uncommon Files |
| .XYD | Uncommon Files |
| .XYE | Uncommon Files |
| .XYF | Uncommon Files |
| .XYG | Uncommon Files |
| .XYH | Uncommon Files |
| .XYI | Uncommon Files |
| .XYJ | Uncommon Files |
| .XYK | Uncommon Files |
| .XYL | Uncommon Files |
| .XYM | Uncommon Files |
| .XYN | Uncommon Files |
| .XYO | Uncommon Files |
| .XYP | Text Files |
| .XYQ | Uncommon Files |
| .XYR | Uncommon Files |
| .XYS | Executable Files |
| .XYT | Uncommon Files |
| .XYU | Uncommon Files |
| .XYV | Uncommon Files |
| .XYW | Text Files |
| .XYX | Uncommon Files |
| .XYY | Uncommon Files |
| .XYZ | Data Files |
| .XYZI | Uncommon Files |
| .XYZRGB | Uncommon Files |
| .XZ | Compressed Files |
| .XZ0 | Uncommon Files |
| .XZ1 | Uncommon Files |
| .XZ2 | Uncommon Files |
| .XZ3 | Uncommon Files |
| .XZ4 | Uncommon Files |
| .XZ5 | Uncommon Files |
| Extension | File Description |
| .XZ6 | Uncommon Files |
| .XZ7 | Uncommon Files |
| .XZ8 | Uncommon Files |
| .XZ9 | Uncommon Files |
| .XZA | Uncommon Files |
| .XZB | Uncommon Files |
| .XZC | Uncommon Files |
| .XZD | Uncommon Files |
| .XZE | Uncommon Files |
| .XZF | Uncommon Files |
| .XZG | Uncommon Files |
| .XZH | Uncommon Files |
| .XZI | Uncommon Files |
| .XZJ | Uncommon Files |
| .XZK | Uncommon Files |
| .XZL | Uncommon Files |
| .XZM | Uncommon Files |
| .XZN | Uncommon Files |
| .XZO | Uncommon Files |
| .XZP | Uncommon Files |
| .XZQ | Uncommon Files |
| .XZR | Uncommon Files |
| .XZS | Uncommon Files |
| .XZT | Uncommon Files |
| .XZU | Uncommon Files |
| .XZV | Uncommon Files |
| .XZW | Uncommon Files |
| .XZX | Uncommon Files |
| .XZY | Uncommon Files |
| .XZZ | Uncommon Files |
| .X_B | CAD Files |
| .X_T | CAD Files |
