>Doug Hennig did an article on using WinZip that way relying on API_APPRUN to fire the app and wait on its completion in FoxTalk; it was fairly painless.

Yep, and Rich Hodder wrote three with DynaZip.

>While WinZip is shareware, the product should be registered for commercial use; it's well worth the $80 or so from my POV.

Yeah, I really wish it had a COM interface.