A package file that is used by the Unreal Tournament 3 3D gaming engine, a free 3D engine that is used by many games. The UPK file contains the various game files that are needed and can be loaded on demand by the 3D engine. These files can include the meshes for the game, the textures, the game rules, the maps, the music, and any other file type that may be used by the game engine.
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