An idea

[Gupta]

Scanning headers is very easy task u only need to know format everything else is very easy.
But for games, it little bit hard where files are compressed, thus u loss headers, check ur self compress mp3 with zlib and then scan with msc


And its very old idea but not practical one for gane compression, good one is compression tool based in game engines that razor suggested sometime ago

U can try urself i will try to help u myself

Another thing could be, something like precomp which already can compress such stuffs internally, that could be more realistic