I have been using DVD Decrypter to rip DVD's as ISO files to my hard drive then using Daemon Tools to mount those images to my virtual F: drive then playing them through PowerDVD. This has been working fine all week but when I went to the PC now I just get an error message from PowerDVD saying Unsupported file type when I try to play them. When I look at the actual files they now have an .MDS file extension. Anyone any ideas what has happened and why they no onger play. The only thing I have done on my PC since the last time they played is setting up Girder. This is madness Thanks.