I wrote too soon. The Info-zip based zip.exe seems to crash on a dir that 
winzip does fine on and compresses to 3.5GB. It stops with an undescriptive 
error midway through a certain file, yet using it to zip a lower folder 
including that file works. I suspect it hits some internal size or number limit 
(the dir has 48k files and >4GB). It also passes over hidden dirs (even when 
told to include) and any (at least top level) dir that has '.' in it, such as 
\temp.now .

-Skip
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