>The command switches for WinZip were on the Nico Mak web site, last time I looked, which was several months ago. They resemble the ol' PKZip switches. Evidently they are an afterthought, or they would have been documented better. There is no mention anywhere I have seen of WinZip being an OLE or DDE server.
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>Since DynaZip is ZIP compatible, distributable in runtime for free, and has every option you could ask for, why on earth does the client care? Maybe you can make your own form and call it WinZip :).

I'm sure I can justify the use of Dynazip. They just wanted to make sure we were not able to use it programmaticaly or not as easy as Dynazip. In big place like this, having something certified is not easy, especially when they already have a certified product which does similar thing.