| Extension | File Description |
| .XC0 | Uncommon Files |
| .XC1 | Uncommon Files |
| .XC2 | Uncommon Files |
| .XC3 | Uncommon Files |
| .XC4 | Uncommon Files |
| .XC5 | Uncommon Files |
| .XC6 | Uncommon Files |
| .XC7 | Uncommon Files |
| .XC8 | Uncommon Files |
| .XC9 | Uncommon Files |
| .XCA | Uncommon Files |
| .XCB | Uncommon Files |
| .XCC | Uncommon Files |
| .XCD | Uncommon Files |
| .XCDATAMODE | Uncommon Files |
| .XCE | Uncommon Files |
| .XCF | Raster Image Files |
| .XCFBZ2 | Plugin Files |
| .XCFGZ | Plugin Files |
| .XCG | Uncommon Files |
| .XCH | Uncommon Files |
| .XCI | Uncommon Files |
| .XCJ | Uncommon Files |
| .XCK | Uncommon Files |
| .XCL | Uncommon Files |
| .XCM | Uncommon Files |
| .XCMD | Uncommon Files |
| .XCMDS | Uncommon Files |
| .XCN | Uncommon Files |
| .XCO | Uncommon Files |
| .XCODEPROJ | Developer Files |
| .XCP | Uncommon Files |
| .XCQ | Uncommon Files |
| .XCR | Uncommon Files |
| .XCS | Uncommon Files |
| .XCT | Uncommon Files |
| .XCU | Settings Files |
| .XCV | Uncommon Files |
| .XCW | Uncommon Files |
| .XCX | Uncommon Files |
| .XCY | Uncommon Files |
| .XCZ | Uncommon Files |
| .XD | Uncommon Files |
| .XD0 | Uncommon Files |
| .XD1 | Uncommon Files |
| .XD2 | Uncommon Files |
| .XD3 | Uncommon Files |
| .XD4 | Uncommon Files |
| .XD5 | Uncommon Files |
| .XD6 | Uncommon Files |
| .XD7 | Uncommon Files |
| .XD8 | Uncommon Files |
| .XD9 | Uncommon Files |
| .XDA | Uncommon Files |
| .XDB | Data Files |
| .XDC | Uncommon Files |
| .XDD | Uncommon Files |
| .XDE | Uncommon Files |
| .XDELTA | Uncommon Files |
| .XDF | Uncommon Files |
| .XDG | Uncommon Files |
| .XDH | Uncommon Files |
| .XDI | Disk Image Files |
| .XDIM | Uncommon Files |
| .XDJ | Uncommon Files |
| .XDK | Uncommon Files |
| .XDL | Uncommon Files |
| .XDM | Misc Files |
| .XDN | Uncommon Files |
| .XDO | Uncommon Files |
| .XDP | Data Files |
| .XDQ | Uncommon Files |
| .XDR | Settings Files |
| .XDRUID | Uncommon Files |
| .XDR_TOR | Uncommon Files |
| Extension | File Description |
| .XDS | Game Files |
| .XDSL | Uncommon Files |
| .XDSSC | Text Files |
| .XDT | Uncommon Files |
| .XDU | Uncommon Files |
| .XDV | Uncommon Files |
| .XDW | Page Layout Files |
| .XDX | Uncommon Files |
| .XDY | Uncommon Files |
| .XDZ | Uncommon Files |
| .XE0 | Uncommon Files |
| .XE1 | Uncommon Files |
| .XE2 | Uncommon Files |
| .XE3 | Uncommon Files |
| .XE4 | Uncommon Files |
| .XE5 | Uncommon Files |
| .XE6 | Uncommon Files |
| .XE7 | Uncommon Files |
| .XE8 | Uncommon Files |
| .XE9 | Uncommon Files |
| .XEA | Uncommon Files |
| .XEB | Uncommon Files |
| .XEC | Uncommon Files |
| .XED | Uncommon Files |
| .XEE | Uncommon Files |
| .XEF | Data Files |
| .XEG | Uncommon Files |
| .XEH | Uncommon Files |
| .XEI | Uncommon Files |
| .XEJ | Video Files |
| .XEK | Uncommon Files |
| .XEL | Video Files |
| .XEM | Settings Files |
| .XEN | Game Files |
| .XENC | Data Files |
| .XEO | Uncommon Files |
| .XEP | Settings Files |
| .XEQ | Uncommon Files |
| .XER | Data Files |
| .XES | Settings Files |
| .XET | Settings Files |
| .XEU | Uncommon Files |
| .XEV | Settings Files |
| .XEW | Uncommon Files |
| .XEX | Game Files |
| .XEY | Uncommon Files |
| .XEZ | Compressed Files |
| .XF0 | Uncommon Files |
| .XF1 | Uncommon Files |
| .XF2 | Uncommon Files |
| .XF3 | Uncommon Files |
| .XF4 | Uncommon Files |
| .XF5 | Uncommon Files |
| .XF6 | Uncommon Files |
| .XF7 | Uncommon Files |
| .XF8 | Uncommon Files |
| .XF9 | Uncommon Files |
| .XFA | Uncommon Files |
| .XFB | Uncommon Files |
| .XFC | Uncommon Files |
| .XFD | Data Files |
| .XFDF | Data Files |
| .XFDL | Web Files |
| .XFE | Uncommon Files |
| .XFF | Uncommon Files |
| .XFG | Uncommon Files |
| .XFH | Uncommon Files |
| .XFI | Uncommon Files |
| .XFJ | Uncommon Files |
| .XFK | Uncommon Files |
| .XFL | Video Files |
| .XFM | Uncommon Files |
| .XFN | Font Files |
| .XFO | Data Files |
| .XFP | Uncommon Files |
