If this were a windoz problem I'd say it was as simple as "you've changed the name of what the file type is." You know those endings like .exe (deathrattle) following all the files in the most complicated file system in the world? Without them the windoze box can't find anything. But Macs have an amazing ability to figure out what to do with certain files or at least ask you how you'd like to handle them. I can't remember now but there's a shareware app. that's really cool that will convert most any file type. I used to use it to play most music files a couple of years ago. I think your renamed "real" files just have to be renamed again back. Try clicking on one and after the title is highlit rename it and end it with .mpeg. I don't suppose any one reading this has any idea why I can't make this new version of Limewire launch a file?