I guess my question would be, does iTunes play it? There are Real Player files out there that seem to be mp3 until you've dwnldd them. One solution is to get a hold of a utility that can change its attributes. 2 examples are: iTuner which is a freeware & it will give the file an iTunes icon & creator so iTunes will always open it. Another is MP3 Rage which you can change its properties & edit the tags (very good app!!!) Some mp 3 players will automatically change the file's creator as soon as it opens the file to that of its own. By the way, 'Hook' is the creator name of iTunes files.
Ignore the above link to iTuner , in fact there's 2 apps with identical names. Instead see: http://web.singnet.com.sg/~hanyen/ituner.html