Extracting music from a certain game

[mbc07]

Some games uses non-standard extensions, you could try renaming to common extensions supported by VGM Stream (e.g. hps, brstm, etc) and see if it works. Another possibility is that WBK is an encrypted container, you may need to extract the song from it if that's the case. People at XeNTaX forums may have a clue about that too, they have a forum section dedicated only to game file formats...