|I think it's a Word Perfect doc file.|
Yes, I suspect that you're both right about the disk being old. Unfortunately all of my floppy disks are about the same age, so I can't compare. I tried several disks with the same result.
I have another floppy drive, so I can try swapping them and see if I get the same message. If so, then it's probably the age of the disks.
Thanks, both of your for your replies.