| File Extension: | UPK |
| File Type Description: | Unreal Engine 3 Package |
| File Type Developer: | Epic Games |
| Primary Associated Software: | Unreal Tournament |
| Primary Software Developer: | Epic Games |
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UPK files are a type of Unreal Engine 3 Package developed for Unreal Development Kit by Epic Games. Commonly, Unreal Engine 3 Package files are found on user computers from United States, and on PCs running the Windows 10 operating system. Google Chrome is their primary internet browser for the bulk of these users.
 | Unreal Tournament by Epic Games |
 | Unreal Development Kit by Epic Games |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Windows |
 | Mac |
 | Linux |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .USA | Microsoft Corporation | Data Files | American English Localization Language File |
| .UKX | Epic Games | Game Files | Unreal Animation Package |
| .UZ | Epic Games | Data Files | Unreal Tournament Server File |
| .PSK | Epic Games | 3D Image Files | Unreal Engine Skeletal Mesh File |
| .JPN | Microsoft Corporation | System Files | Windows Japanese Noise-Word List File |
| .J2S | Epic Games | 3D Image Files | Jazz Jackrabbit 2 Language Data |
| .J2V | Epic Games | Video Files | Jazz Jackrabbit 2 Cinematic File |
| .VERSION | Open Source | Data Files | Linux GateD Daemon Data |
| .CWG | Epic Games | Game Files | Castle Of The Winds Data |
| .J2I | Epic Games | Game Files | Jazz Jackrabbit 2 Internet Server Link File |
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