OK, I remembered reading about how WinZip was nearly Gold but not quite. There was a problem with the richedit control. If I install the richedit control into Crossover 1.3.1 from here
http://www.allerasoft.com/download/
I can view comments in WinZip OK. Unfortunately if I do this (try with the example zip file in the winzip directory) it crashes on exit. I might try some proper traces this afternoon, but is there a reason Wine can't mirror the richedit update program and install it a la DCOM?