Maybe you can try this video converter software, it can convert any videos to all popular formats. how to convert MTV to AVI
Hope it will help you. 
For a while, I had my old MP3 player that had some good videos and they had to work in an MTV file. It worked, until a couple years later, I had switched to three different computers and MP3 players that had served their time like this old player I still have. It somehow still works after not using it for years. The only issue is now that I want these videos transferred to an AVI file for my new MP3 player.
So is there any way that I can re-code these files into an AVI file? I have tried, but it kept giving the error button all the time. And I have all Codec files downloaded but they still don’t want to transfer!! Please help!