RAW audio files

I extracted audio files from Heroes IV video game. But they all RAW and every file has own format: some 8-bit, some 16-bit unsigned, some 16-bit signed big-endian. Are there a way to guess audio format from content? Preferably non-calculus based.

Also, it seems that russian modding comunity is full greedy retards. Nobody of them want to share heroes 4 map file formats (they reversed it to create random map generator) or executable memory mappings. Does this apply to modding scene in general or only to russian modding scene?