| .wolfquest |
WolfQuest Saved Game |
| .wa2 |
Wonderland Adventures Custom Adventure File |
| .wxn |
Waixing Famicom Game ROM |
| .wldx |
World Map File |
| .wotmod |
World of Tanks Modification File |
| .wgf |
Widelands Game File |
| .wrpl |
Widelands Saved Game File |
| .wrpl.wgf |
Widelands Initial Saved Game File |
| .wl1 |
Wolfenstein 3D Data File |
| .wop |
Wonderland Object Preset |
| .xex |
Xbox 360 Executable File |
| .xpd |
PlayStation Store PSP License File |
| .xbe |
Xbox Executable File |
| .xpk |
WWE RAW Model File |
| .xmb |
X-Wing Mission Briefing File |
| .xen |
Guitar Hero III Data File |
| .xs |
Age of Empires 3 Map AI Generator |
| .xom |
Worms 3D Object File |
| .xds |
DS Game Maker Project File |
| .xa |
PS1 Audio File |
| .xp3 |
KiriKiri Package File |
| .xnb |
XNA Game Studio Binary Package |
| .xci |
Nintendo Switch Game Backup File |
| .xbsav |
Mass Effect 2 Xbox Saved Game |