I'm going to say "no" on the MFS issue. I rarely if ever see a 400K disk (the only one I can think of that I've used lately is my MacWrite/MacPaint master and I think I only own about a dozen disks formatted as 400K). I think the last program I ran from one was Millionaire, which I last played on my Lisa under MacWorks. Just saw that disk along with MacVegas in among my master disk collection the other day.