Update: I finally managed to go through all of the floppy disks I inherited, and I was able to recover 95% of the files that my grandfather saved on these floppy disks. I had a few files that were unreadable, and a few files that were zipped files but Archive utility was not able to open those zipped files, but overall I was able to recover a LOT of photos and some documents. Very excited and happy that I was able to get these recovered after worrying whether or not they're readable on my modern 2019 iMac desktop with a Monterey OS.
Yes, but it uses a completely different format with different file extensions since the mid 2000s. And it was replaced by MS Word pretty much everywhere by the late 1990s. That would also be the time to which I would date these files at the latest.
Exe files are Windows or DOS programs, pqf files are "Presentations" files, essentially an equivalent to PowerPoint from the same company as WordPerfect.
There will most likely be lots of clues about both the file type and the contents of the file in these results.
You could also download the trial version of BBEdit and open the files there, but then you'll possibly have to scroll past vast amounts of binary data in search of clues.