I am using LimeWire 2.7.13. on System OSX version 10.1.5 I sometimes get that corrupt file message, but when I play the file using iTunes version 3.0.1 there seems to be no problem.

In LimeWire preferences I set don't clear completed downloads automatically and I don't use LimeWire as the default player. I also specified my own download folder with a name that I made up.

Don't know if this will help but give it a shot.