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.

>>14
That's more sane than >>1's request of no calculus. >>1's request cannot be done while >>13 is quite possible.