Around Christmas there was a big update to the Mac operating system and also an update to Crossover for Mac. Together (and I'm not sure which one is to blame) it meant that if you were running the Wessex Pricing Program on your Mac using Crossover - it would no longer start (with an error message helpfully saying "Unknown error"!).
My solution is fairly drastic - delete the program and re-install it (it works, honest!).
"Ah!"I hear you say "If I can't start the program how can I make a copy of those 2 important data files (V3.mdb, & User.xml) which configure the program to my business?"
Fear not, the next paragraph will show you how to get to these, and so preserve your data.
Open Crossover and highlight the "Wessex Pr..." bottle (on the left hand side). Then click the little cog at the bottom left of the Crossover screen. This will bring up some options. Select "Open C: Drive" (see first screenshot).