This is totally frustrating. For some unholy reason, I need to run some software that only runs on Windows NT 4, specifically with SP6 High Encryption installed.  I thought this would be a cakewalk on Fusion, but Fusion refuses to run Windows NT4. Why, I don't know. It only complains that the fast fat.sys driver is corrupted or missing. 

Every time. Whether that is a fresh install from the CD's or not. 

It *does* however run just ducky on VMWare Workstation 17. Unfortunately for me, Fusion is the primary VMWare product I use on an always on Mac mini. I just dropped $208 for a copy of Workstation 17 and put it on a Windows laptop, but that is not a viable solution for more than a week or so. 

The VM built on Workstation 17 by the way, won't run on Fusion 14 when copied over. Same dang error. 

Arghhh! 

Help, please?  I know this is an out of date really old OS, but even gently hinting at that to the customer results in a furious glare. Directed at me. 

Yours,

-Paul