The disks that are formatted DOS, have you tried them in an old PC with a 5.25" floppy drive? The PRODOS disks can be read by a Mac but the Apple 5.25" drive is rare and reads DOS, not PRODOS. Dayna File drives would read both sizes but they are also hard to fine. If you Google for Dayna File disk drives, you will take a trip down memory lane. Here is one such site:
http://links.jstor.org/sici?sici=0018-2133(199012)73%3A4%3C1185%3ACTFLF%3E2.0.CO%3B2-4
This article in the Microsoft Knowledge Base gives a idea of options to consider:
http://support.microsoft.com/kb/57345
( Is it legal to quote a Microsoft KB article on an Apple website? : ) )
Your challenge is hardware. You will have to find some computer that has both a 5.25" drive and a 3.5" drive or a SCSI hard drive. If you had a backup copy, you could try mailing the backup disk to someone who has the hardware options needed to make the transfer.
If you can find an old modem, you could send the file to a bulletin board and then download again to a newer machine. It has been 20 years since our Apple II c was connected to a modem. We only use it for games any more. If you can find an old modem, that would give you new options.