.bin is universal for anything... binary.
(hence... "bin")
Anyway, it depends on what kind of file that is. Better way to do it is hex edit the file, then look for an audio header. It'll tell you what format the file is, where its data starts and where the data ends. You can then use the hex editor to extract the data chunk (and the header) out into another file, and that file would be the sound file you're looking for. (oh yeah, and you still need to fix the header in the new sound file)