So...the $50,000 question - what does the FileWare program do? I wouldn't think it would be anything related to Twiggy drives or disks, since theoretically they should work without needing any driver.

I think you'll probably find a few 128k/512k/Plus machines that have had fans added to them - even back in the day they were well known for having the analog boards die prematurely due to overheating.