Still use Quattro Pro v4 (DOS) and also v12 (Win). DOS version is for messing around, and also when I feel like getting Borland Reflex going. DOSBox is best environment – for me this is under XP.
Compatibility is an issue until you remember that all you really need to save is values, so go for CSV. Most formulae will need fixing so if were me, I’d work from scratch. depends on how well you know your original file (heh-heh). One thing the QPro did that Excel never really bothered to replicate was interactive slide shows. A block of data and some work on charting and you were ready to go. A big no-no in Excel and (as far as I could tell) Lotus 1-2-3 of the time.
Here’s my blog posting on Quattro Pro