| .xqy |
XQuery Source File |
| .xfr |
iProcess Process Definition File |
| .xyzv |
Celestia Sampled Trajectory File |
| .xvmconf |
World of Tanks XVM Configuration File |
| .xensearch |
XenCenter Saved Search File |
| .xct |
XVI32 Character Conversion Table File |
| .xtb |
Angular Translation File |
| .xy |
XYWrite Document |
| .xp |
Fastracker 2 Pattern |
| .x4k |
XML4King Configuration File |
| .xgp |
Xfire Game Patcher File |
| .xcsl |
CineStyle Color Correction File |
| .yml |
YAML Document |
| .y |
Yacc Source File |
| .yaml |
YAML Ain't Markup Language data file |
| .ydk |
Yu-Gi-Oh! Deck File |
| .yfs |
YSFLIGHT Mission File |
| .yrcdat |
YRC Software Data Script |
| .yab |
Yabasic Source Code |
| .zap |
Zero Administration Package File |
| .zrtf |
Nisus Compressed Rich Text File |
| .zma |
Impedance File |
| .zeg |
ZeroG Subtitles File |
| .r8 |
RAW graphics file; Android App Shrinker, Optimizer, and Obfuscator file |