In this video will go in details about how to use the UnrealPak commandline tool to unpack a game packed *.pak file, modify it, remove what might not be needed for the game in order to reduce the final game size, and then pack and compress the game data into a *.pak file again.
More stuff@
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//Update:
As of today, most recent version is UE5.2 and everything in the video still doable, all commands still valid. You can still extract and repack a pak file at the same way.
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