Hello!
First try this:
Drag the LimeWire document out of your Shared Directory onto your Desktop now manually add the .mp3 file extension to the file then open up iTunes and from the file menu select Add To Library and now browse to your file on the Desktop and select it and click add now in iTunes library browse to the file it should be there somewhere and double click it and it should start playing.Now when you know that it worked you have to once again move the file from the Desktop to wherever on your HD that you keeps your music files.Now double click the file in iTunes once again to start playing it but you will get an error message telling you that the file was not found(Because you moved it and broke the path to it) and if you want to look it up select yes and once again browse to it and it should start to play.
If all this do not work then read my posts in this thread which also could apply to you:
http://www.gnutellaforums.com/showth...threadid=12351