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with experience, I recognize certain types of files (.pak .ucas .utoc , bundle ect)
and I know that such and such a file will use such and such an algorithm.
then, by digging into the game's folders, you can find a library that puts you on the right track (liblz4, oodle ect).
and finally various tests...
Personally, I work in a test folder, trying out different combinations, different library versions
when I've found the best compromise, I test in DSG.
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