This is the specifications for the archive file which is handled by the Game Extractor plugin Archive_UE3_Generic.

Endian Order:Little Endian
Compression:ZLib, LZO, LZX
Encryption:None


This format is used by the following Games:
Brothers: A Tale of Two Sons *.u upk umap
Frontlines: Fuel Of War *.upk
Alien Breed: Impact *.u upk umap
Alien Breed 2: Assault *.u upk umap
Alien Breed 3: Descent *.u upk umap
Get Even *.upk
Legendary *.ppk
Legendary *.u
Legendary *.upk
Magrunner *.upk
Red Orchestra 2 *.upk
RoboBlitz *.rbd
RoboBlitz *.u
RoboBlitz *.upk
Stargate Worlds *.upk


These are the accompanying notes and further information:
 
Generic Unreal Engine 3 Archive


Game Extractor is able to read files of this type, as well as files from thousands of other games. To give it a try, download Game Extractor (Basic Version) for free, and see what it can do.

For further information on this format, refer to the source code on our GitHub repository.