Happy, you are unfamiliar with the PSR 620 I guess. That keyboard had a midi player attached beneath the keys but in addition to making MIDI files on a PC, one could create songs ON THE KEYBOARD to a floppy known as SDG That was the file ending NOT midi and isn't there anyone you know that ever owed a PSR 620? They would know what I am talking about.Are these song files or style files? Are you sure about the extension? Google doesn't really bring up much. If they're style files I think you're SOL.
Thanks DickYou can also try to replace the floppydrive in the keyboard if you can find one. NOT all brands are compatible but ALPS, Mitsubishi and Toshiba (and a few other brands) are used in Yamaha keyboards. NEC did not work in one of my boards as it was not 100% compatible.