When Limewire downloads an audio file, it gives it a creator code
of TVOD, with the result that when the file is double-clicked, the
Apple MoviePlayer is launched to play it. (This is apparently a fix
installed in version 1.7, before that it used the Limewire creator code.)

Others have complained about this frequently -- search this forum
on the word "creator" to see.

I would like to play my audio files using Audion which uses a creator
code Audn, but other people have other favorite players, e.g. iTunes
or SoundJam with creator code SJAM. It is possible for a user to change
the creator code but that is not a standard Finder operation -- you need
various shareware programs to do it, and it is a manual step you have
to go through before you can play a file.

Limewire could fix this easily with a Preference setting for the 4-letter
Creator code to use when creating an audio file.