> > > > why in the world would the TurboTax app be making any sort > of writes, > > let along changes of any kind to the disk's MBR? > On Linux, running under wine as a normal (non-root) user, I strongly suspect you could not modify the real master boot record. What wine would do when a write to the MBR was requested is beyond my knowledge of wine. I suppose it would be worth trying on a spare box just to see what goes. Bob Styma