Best Compression Methods for 'Specific' Games. Q&A

[L33THAK0R]

Whats the best method for processing unencrypted UE4 ".pak" files? I've tried just applying xtool's zlib+reflate / oodle codecs but whilst the streams are picked up I always have issues decompressing, with the archives being reported as corrupted. I used to just process the pak's by unpacking and compressing the loose files but with larger titles this isn't very efficient for the user's disk I/O and with some titles I'm investigating currently (such as "Phantom Doctrine"), seemingly random files fail to decompress, pushing me to investigate again into packing the compressed ".pak" files as they're originally presented instead.