Prism SNG format to MIDI?

The last time I did MIDI was with Prism, a DOS-Based Sequencer by MIDISOFT, in the early 90's. I wish they were still in business, because it saved the songs in a proprietory format with a SNG suffix. It came with a utility for converting it to midi, and it just doesn't exist anywhere on the internet.

Changing the suffix from SNG to MID does not work.

I have noticed plenty of others in the same boat as me, all of us searching for a copy of that 3.5 diskette or the files therein.

Any Ideas? Maybe a program that will open the file code and allow me to visually compare it with a general midi file. Maybe only the header is different or something.

Any help would help.

Thanks