Hi Alex
re new to this--been there too, just about every week--the LimeWire project and OSX are developing so quickly it's tough to know is going on, but very interesting (and frustrating until you know to expect the unexpected).

Re the problem with your files: sorry about assuming you knew about the Mac Finder's "Get Info" command.
When you click on one of the .mp3's in your incomplete folder (or elsewhere) and use the "open with" options to set iTunes or LW as the app to open that file, there's also the option to "Change All" similar files. Hope that helps.

I see you saw Roger's post--good of him to volunteer time and expertise to write code that helps us, AND help us use it!

Cheers