Well, this is Gnotella forums, not Limewire. I don't remember how Limewire works, and if it changes the file type as Morpheus does to a partial file. Gnotella does not. Even if the download has not been finished you can open that file.

It could also be that you another application is using the wave output. Close all programs that could be using it, for example, media players.

Ivan
"In the dark we make a brighter light"