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upkg wiki
The basics of the Unreal Tournament package format is written down by Antonio Cordero in his UT_Pacakge_File_Format document_v1.6 which Antonio Cordero marks as very old and incomplete. Further information can be extracted from his Unreal Tournament Package Delphi Library. Also a lot of information is available on the Unreal Wiki. The goal of this wiki is to integrate the knowledge required to extract objects from packages and be more comprehensive about the datastructures.
The wiki and package are a "Work in Progress", these are used to explore objects and recreate them but tend to reach this goal as fast as possible. Therefore not all objects are described and implemented to their full extent. (In upkg.pm the implementation of Brushes is currently very dirty (only returns the vertices), hence it's ommited from the package but described here).