| xfbin | Naruto Shippuden: Ultimate Ninja Storm 2 Data |
| xfs | Gunbound Game Data |
| xg | eXtreme Gammon Game Data |
| xga | Diamond Mind Baseball Account Info |
| xmb | Age of Empires XMB Data |
| xmb | Test Drive Unlimited Archive |
| xmb | X-Wing Mission Briefing |
| xmg | The Longest Journey XMG Image |
| xmod | Age of Wushu 3D Model Data |
| xne | Krazy Rain Note |
| xni | Star Wars: The Force Unleashed Game Data |
| xnt | Krazy Rain Note |
| xof | Reality Lab 3D Image |
| xom | Worms 3D Object |
| xp | XPilot Map |
| xp0 | Stalker Data |
| xp1 | Stalker Data |
| xp2 | Stalker Data |
| xp2 | XPilot NG Map Data |
| xp3 | KiriKiri Package |
| xp4 | KiriKiri Package |
| xpac | Sonic and Sega All-Stars Racing Audio Archive |
| xpak | Call of Duty Game Archive |
| xpix | Nonogram Puzzle |
| xpk | WWF RAW Game Model |
| xpl | X-Plane Plug-in |
| xr1 | Xargon Data |
| xr1 | Xargon Game Data |
| xrd | Core Wars Game Data |
| xrs | Dig It! Game Data |
