extracting files from Rabi-Ribi?

[Daxar]

(Oh, and if there's one gigantic file way bigger than the others, that's the one you want)

In this case, it's pack.kanobi. It looks to be compressed and/or encrypted somehow; the specifics of the format will vary based on what engine the game uses (which I'm finding very little info online about). I personally can't help much beyond here myself, as compression formats are basically magic as far as I'm concerned.