You would need to know the structure of the file, but you might not be able to find it if it's proprietary. If you have a converter available you might be able to convert a file into a file type you can read (in this case, maybe something like MP3 would be easier to work with).
Beyond that, there isn't much you can do, all files are just a series of bytes, there's no magic way to translate any file into a useable form.
This page[
^] looks like it has some information that could point you in the right direction.