| Extension | File Description |
| .XJO | Uncommon Files |
| .XJP | Uncommon Files |
| .XJQ | Uncommon Files |
| .XJR | Uncommon Files |
| .XJS | Uncommon Files |
| .XJT | Uncommon Files |
| .XJTGZ | Uncommon Files |
| .XJTZ2 | Uncommon Files |
| .XJU | Uncommon Files |
| .XJV | Uncommon Files |
| .XJW | Uncommon Files |
| .XJX | Uncommon Files |
| .XJY | Uncommon Files |
| .XJZ | Uncommon Files |
| .XK0 | Uncommon Files |
| .XK1 | Uncommon Files |
| .XK2 | Uncommon Files |
| .XK3 | Uncommon Files |
| .XK4 | Uncommon Files |
| .XK5 | Uncommon Files |
| .XK6 | Uncommon Files |
| .XK7 | Uncommon Files |
| .XK8 | Uncommon Files |
| .XK9 | Uncommon Files |
| .XKA | Uncommon Files |
| .XKB | Uncommon Files |
| .XKC | Uncommon Files |
| .XKD | Uncommon Files |
| .XKE | Uncommon Files |
| .XKF | Uncommon Files |
| .XKG | Uncommon Files |
| .XKH | Uncommon Files |
| .XKI | Uncommon Files |
| .XKJ | Uncommon Files |
| .XKK | Uncommon Files |
| .XKL | Uncommon Files |
| .XKM | Uncommon Files |
| .XKN | Uncommon Files |
| .XKO | Uncommon Files |
| .XKP | Uncommon Files |
| .XKQ | Uncommon Files |
| .XKR | Uncommon Files |
| .XKS | Uncommon Files |
| .XKT | Uncommon Files |
| .XKU | Uncommon Files |
| .XKV | Uncommon Files |
| .XKW | Uncommon Files |
| .XKX | Uncommon Files |
| .XKY | Uncommon Files |
| .XKZ | Uncommon Files |
| .XL | Spreadsheet Files |
| .XL$ | Uncommon Files |
| .XL0 | Uncommon Files |
| .XL1 | Uncommon Files |
| .XL2 | Uncommon Files |
| .XL3 | Uncommon Files |
| .XL4 | Uncommon Files |
| .XL5 | Uncommon Files |
| .XL6 | Uncommon Files |
| .XL7 | Uncommon Files |
| .XL8 | Uncommon Files |
| .XL9 | Uncommon Files |
| .XLA | Plugin Files |
| .XLAM | Plugin Files |
| .XLAMENX | Uncommon Files |
| .XLAT | Uncommon Files |
| .XLB | Settings Files |
| .XLC | Data Files |
| .XLD | Database Files |
| .XLE | Uncommon Files |
| .XLF | Text Files |
| .XLG | Uncommon Files |
| .XLGC | Data Files |
| .XLH | Uncommon Files |
| .XLI | Uncommon Files |
| Extension | File Description |
| .XLJ | Uncommon Files |
| .XLK | Backup Files |
| .XLL | Plugin Files |
| .XLM | Executable Files |
| .XLN | Uncommon Files |
| .XLNK | Misc Files |
| .XLO | Uncommon Files |
| .XLP | Uncommon Files |
| .XLQ | Uncommon Files |
| .XLR | Spreadsheet Files |
| .XLS | Spreadsheet Files |
| .XLSB | Spreadsheet Files |
| .XLSBENX | Uncommon Files |
| .XLSENX | Uncommon Files |
| .XLSHTML | Spreadsheet Files |
| .XLSM | Spreadsheet Files |
| .XLSMENX | Uncommon Files |
| .XLSMHTML | Spreadsheet Files |
| .XLSX | Spreadsheet Files |
| .XLSXENX | Uncommon Files |
| .XLT | Data Files |
| .XLTHTML | Spreadsheet Files |
| .XLTM | Spreadsheet Files |
| .XLTMENX | Uncommon Files |
| .XLTX | Spreadsheet Files |
| .XLTXENX | Uncommon Files |
| .XLU | Uncommon Files |
| .XLV | Plugin Files |
| .XLW | Misc Files |
| .XLX | Uncommon Files |
| .XLXML | Uncommon Files |
| .XLY | Uncommon Files |
| .XLZ | Uncommon Files |
| .XM | Audio Files |
| .XM0 | Uncommon Files |
| .XM1 | Uncommon Files |
| .XM2 | Uncommon Files |
| .XM3 | Uncommon Files |
| .XM4 | Uncommon Files |
| .XM5 | Uncommon Files |
| .XM6 | Uncommon Files |
| .XM7 | Uncommon Files |
| .XM8 | Uncommon Files |
| .XM9 | Uncommon Files |
| .XMA | Uncommon Files |
| .XMAP | Data Files |
| .XMAS | Uncommon Files |
| .XMB | Game Files |
| .XMC | Uncommon Files |
| .XMCD | Data Files |
| .XMD | Disk Image Files |
| .XME | Uncommon Files |
| .XMF | 3D Image Files |
| .XMFG | Uncommon Files |
| .XMG | Uncommon Files |
| .XMH | Uncommon Files |
| .XMI | Audio Files |
| .XMIT | Uncommon Files |
| .XMJ | Uncommon Files |
| .XMK | Uncommon Files |
| .XML | Data Files |
| .XMLBACKUP | Uncommon Files |
| .XMLS | Uncommon Files |
| .XMM | Uncommon Files |
| .XMN | Uncommon Files |
| .XMO | Uncommon Files |
| .XMP | Misc Files |
| .XMPCF | Uncommon Files |
| .XMPSES | Uncommon Files |
| .XMPTF | Uncommon Files |
| .XMQ | Uncommon Files |
| .XMR | Uncommon Files |
| .XMS | Uncommon Files |
| .XMT | Uncommon Files |
| .XMT_BIN | 3D Image Files |
