@ afisk

WOW! I would LOVE to be able to specify the application that a downloaded file recognizes as the default program to open it. and not just MP3's either, that would be so handy with text files (which usually default to SimpleText when I prefer AppleWorks) and gif/jpg images (usually default to QuickTime PictureViewer when I prefer PhotoShop) too.
Your FAQ describes how Windows users can change default program recognition easily, but no Mac help there. It would be great to see that as part of the Limewire program in a future release.

I can definatly tell you that right after I installed the Quicktime 5 update all my Limewire downloads were saved as Quicktime media files when moved to the "shared" folder, so I do believe QT was at fault not LimeWire. However, there does not seem to be a way to change this setting back in the LimeWire program.

QuickTime MP3's have a creator code of TVOD
Generic MP3's have a creator code of MAmp (usually) or Audn (rarely)
I do not know about SoundJam or iTunes. I believe "hook" creator code is for iTunes but I am not sure, sorry.

My current workaround involves using the shareware program FileTyper ($10 shareware fee), download at http://www.ugcs.caltech.edu/~dazuma/filetyper/ to manually change the creator codes on the files. It's a bit time consuming but it does work.
Also another program called "Resorcerer" was mentioned above but I am unfamiliar with it.