looking for help creating a mime type

[kendell clark]

hi all
After a lot of digging through my cd collection, I came across an
audible audio file I had backed up who knows how long ago. I've been
wanting to create fully functioning mime types for this and it's
enhanced audio counterpart for a while now. I'm a complete novice at
this, so I'm looking for any willing helpers. I can upload the files
somewhere so if anyone decides to help me they can have access to them.
Note that these are legal files, legally obtained from audible with an
active account, mine. Well, not active anymore, but it was when these
files were obtained. These seem to be mp3 files with some strange stuff
at the beginning, because simply renaming the file extension doesn't
allow them to be played, but I can easily convert them with ffmpeg. Any
help would be greatly appreciated.
Thanks
Kendell Clark