User blog comment:뱀파이어 쿠키/About Cookie Run Sound Files/@comment-33658145-20160712024028/@comment-33658145-20160712080405

I know you don't record them, but the ones that I have uploaded are either taken from YouTube or recorded. What I mean is, if you do manage to extract the high-quality sound files from the .fev file, then maybe you can replace the existing newer sound files with the high-quality rips. Take the Tower of Frozen Wave World Select BGM for example.

I tried doing the same thing, and yeah... I wonder what is actually going on. Probably encrypting files is hard.

I know the green folders mean something, but why do even the sound files located in the normal-looking folder cannot be played?

UPDATE: I tried keeping Sea Fairy Cookie's BGM .fsb file together with the .fev file, and now it says "Unsupported file or audio format". Hmm...