upk
There are 4 repositories under upk topic.
EliotVU/Unreal-Library
UnrealScript decompiler library for Unreal package files (.upk, .u, .uasset; etc), with support for Unreal Engine 1, 2, and 3
UE-Explorer/UE-Explorer
UnrealScript decompiler and explorer tool for Unreal Engine packages.
VenoMKO/RealEditor
Tera Online 32-bit and 64-bit client package(*.gpk, *.gmp, *.upk, *.umap, *.u) editor/viewer
tuokri/UE3ShaderCachePatcher
Windows app that patches ShaderCache object references in UE3 script (.u) packages to make the shader caches automatically load when loading mod scripts.