MDRiggs

My son has a bunch of MDs containing files he created himself, mostly of his own voice edited in ProTools and then transferred to MD. It would be nice to be able to get those files back into a PC, but I can't find a way to do this with a Sony MZ-NE410 Net MD Walkman. We have SonicStage 4.3 installed on the computer, and it can find the files fine via USB, but it refuses to transfer them. Any help welcome. Thanks. Michael