>>Exactly! The GUI knows how to deal with it, but not the command line or internal COPY commands.
>
>I believe MS licensed code from the makers of DynaZip and used it to enhance the XP Windows Explorer to make working with .zip files more transparent - as claimed below, on the left:
>
>http://www.innermedia.com/dz/index.htm
>
>If you can automate Explorer that would probably do the trick - maybe the XP FileSystemObject has some methods earlier versions of Windows don't have. Just a SWAG.

Automating Explorer, now that's an option I hadn't considered. I may not need it now as I've found a DLL that does ZIP files from http://xstandard.com.