I  still  have  a  lot  of old CDs containing various backups. Oh, the
  irony: I can read the CDs  without  difficulty,  even  though  they're
  about 15 years old CD-Rs. But back then, I didn't care much about file
  formats.  Hence, it's some proprietary stuff. I don't have the Windows
  software  around  anymore  to  actually  use  those  files. Worse, the
  company in question  got  bought  by  Norton  who,  in  turn,  stopped
  developing that program.

  Sucks.

  What now? Reverse-engineer the file format?