I have been having the same problem with files turning into LimeWire documents, most are .sit files and when you click on them it opens up LimeWire app and nothing happens. I also tried the MP3 Rage thing it works on some files but not on all. Seems like there should be some way to open these files. Seems like the problem started when I upgraded to the latest version 2.3.3 of LimeWire.