If the mds file won't mount to Dameon Tools, then someone may have renamed the .mds file.
Upload the mds file as an attachment, so I can check it out.
If you can mount it to Daemon Tools then you can use ISOBuster to make a bin/cue for you which is what I do with mds/mdf files.
EDIT--I've never had a problem with ISOBuster, but I have noticed that if you use it to convert a cdi (DiscJuggler) file to bin/cue, you will get thousands of errors in the empty/unused sectors.
