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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .BIN | Unknown Developer | Disk Image Files | Binary Disk Image File | Unreal Tournament | Epic Games |
| .CWG | Epic Games | Game Files | Castle Of The Winds Data | Castle of the Winds | Epic Games |
| .DAT | Unknown Developer | Game Files | Game Data | Unreal Tournament | Epic Games |
| .DDT | Sports Interactive | Game Files | Football Manager Keep Player Data File | Jill Of The Jungle | Epic Games |
| .DEM | Valve | Game Files | Video Game Demo File | Unreal Tournament | Epic Games |
| .DZ | Digital Extremes | Game Files | Land Of The Dead Level File | Unreal Tournament | Epic Games |
| .ESN | Epic Games | Game Files | Unreal Engine Language Localization | Unreal Tournament | Epic Games |
| .FRA | Electronic Arts | Game Files | FIFA World Cup Game Data | Unreal Tournament | Epic Games |
| .J2A | Epic Games | 3D Image Files | Jazz Jackrabbit 2 Animation Data | Jazz Jackrabbit 2 | Epic Games |
| .J2B | Epic Games | Game Files | Jazz Jackrabbit 2 Music Data | Jazz Jackrabbit 2 | Epic Games |
| .J2D | Epic Games | Game Files | Jazz Jackrabbit Data File | Jazz Jackrabbit | Epic Games |
| .J2E | Epic Games | Game Files | Jazz Jackrabbit 2 Episode File | Jazz Jackrabbit 2 | Epic Games |
| .J2H | Epic Games | Game Files | Jazz Jackrabbit 2 High Scores | Jazz Jackrabbit 2 | Epic Games |
| .J2I | Epic Games | Game Files | Jazz Jackrabbit 2 Internet Server Link File | Jazz Jackrabbit 2 | Epic Games |
| .J2L | Epic Games | Game Files | Jazz Jackrabbit 2 Level File | Jazz Jackrabbit 2 | Epic Games |
| .J2S | Epic Games | 3D Image Files | Jazz Jackrabbit 2 Language Data | Jazz Jackrabbit 2 | Epic Games |
| .J2T | Epic Games | Game Files | Jazz Jackrabbit 2 Tile Set | Jazz Jackrabbit 2 | Epic Games |
| .J2V | Epic Games | Video Files | Jazz Jackrabbit 2 Cinematic File | Jazz Jackrabbit 2 | Epic Games |
| .JN1 | Epic Games | Game Files | Jill Of The Jungle Data File | Jill Of The Jungle | Epic Games |
| .JPN | Microsoft Corporation | System Files | Windows Japanese Noise-Word List File | Unreal Tournament | Epic Games |
| .KA | Epic Games | Game Files | Karma Engine Asset Data | Unreal Tournament | Epic Games |
| .KOR | Epic Games | Game Files | Unreal Engine Language Localization | Unreal Tournament | Epic Games |
| .PSA | Epic Games | 3D Image Files | Unreal Engine Skeletal Animation File | Unreal Tournament | Epic Games |
| .PSK | Epic Games | 3D Image Files | Unreal Engine Skeletal Mesh File | Epic Games Unreal Engine | Epic Games |
| .T3D | Epic Games | 3D Image Files | Unreal Engine 3D Object File | Unreal Tournament | Epic Games |
| .U | Epic Games | Game Files | Unreal Tournament Class Package | Unreal Tournament | Epic Games |
| .UAX | Epic Games | Audio Files | Unreal Audio Package | Unreal Tournament | Epic Games |
| .UC | Epic Games | Game Files | UnrealScript Class | UnrealEd | Epic Games |
| .UHTM | Epic Games | Game Files | Unreal Tournament Data File | Unreal Tournament | Epic Games |
| .UKX | Epic Games | Game Files | Unreal Animation Package | Unreal Tournament | Epic Games |
| .UMAP | Epic Games | Game Files | Unreal Engine Map File | Unreal Tournament | Epic Games |
| .UMOD | Epic Games | Game Files | Unreal Tournament Module File | Unreal Tournament | Epic Games |
| .UMX | Epic Games | Game Files | Unreal Music Package | Unreal Tournament | Epic Games |
| .UNR | Unreal Software | Game Files | Unreal Level Map | UnrealEd | Epic Games |
| .UPK | Epic Games | Game Files | Unreal Engine 3 Package | Unreal Tournament | Epic Games |
| .USA | Microsoft Corporation | Data Files | American English Localization Language File | Unreal | Epic Games |
| .USX | Epic Games | Game Files | Unreal Static Meshes | UnrealEd | Epic Games |
| .UT2 | Epic Games | Game Files | Unreal Tournament 2003/2004 Map | Unreal Tournament | Epic Games |
| .UT2MOD | Epic Games | Game Files | Unreal Tournament 2003/2004 Module File | Unreal Tournament 2003 | Epic Games |
| .UT3 | Epic Games | Game Files | Unreal Tournament 3 Map File | Unreal Tournament | Epic Games |
| .UT4MOD | Epic Games | Game Files | Unreal Tournament 2004 MOD Installation Package File | Unreal Tournament 2004 | Epic Games |
| .UTX | Epic Games | Game Files | Unreal Texture Package | Unreal Tournament | Epic Games |
| .UVX | Epic Games | Game Files | Unreal Tournament 2003 Saved Game File | Unreal Tournament 2003 | Epic Games |
| .UXX | Epic Games | Game Files | Unreal Tournament 2003 Cache File | Unreal Tournament 2003 | Epic Games |
| .UZ | Epic Games | Data Files | Unreal Tournament Server File | Unreal Tournament | Epic Games |
| .VERSION | Open Source | Data Files | Linux GateD Daemon Data | Unreal Tournament | Epic Games |
| .XXX | BloodDolly | Encrypted Files | TeslaCrypt 3.0 Ransomware Encrypted File | Unreal Tournament | Epic Games |
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