| ttarch2 | The Walking Dead: Season Two Game Data |
| ttg | Red Alert 3 Game Data |
| ttm | Tower Toppler Mission |
| tun | LEGO Racers Audio Data |
| tut | Children of the Nile Tutorial Data |
| tvi | Terminal Velocity Animation Data |
| tvm | Tribes: Vengeance Map Data |
| twt | Carmageddon 2 Game Data |
| txb | Descent 2 Text File |
| txc | EverQuest Texture Cache |
| txd | GTA Texture Data |
| txi | KOTOR 2 Game Data |
| typ | Aces Hight Map TYP Data |
| tzf | Overlord Save Game Data |
| u8 | Lemmings 3D Audio File |
| uasset | Unreal Asset Data |
| uax | Unreal Tournament Sound Package |
| ubn | The Fall: Last Days of Gaia Data |
| uc | UnrealScript File |
| ucl | Killing Floor System File |
| ucm | Crazy Machines Model |
| ucx | Brothers In Arms: Earned In Blood Game Data |
| udk | Unreal Engine 3 Level Package |
| ufo | Spring HAPI Compressed Data File |
| ugc | Ace of Spades Game Data |
| ugx | Unreal 2: The Awakening Data |
| uhtm | Unreal Tournament HTML Data |
| uka | FIFA 2000 Game Data |
| ukx | Unreal Tournament Animation Package |
| umap | Unreal Engine v4 Map |
| umd | Splinter Cell: Blacklist UMD Data |
| umj | Tribes: Vengeance Data |
| ums | Rune 3D Mesh |
| umx | Unreal Tournament Music Package |
| un3 | Unreal 2: The Awakening Game Data |
