>We are using some WinZip command line, but moving to using the Zip library in our Chilkat bundle that we bought some years ago. For a single developer the bundle (all sorts of utilities like FTP and SFTP) is $289. It includes .NET DLL as well and we are using that in our .NET development.
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>I prefer the Chilkat Zip to the WinZip command line because it doesn't popup a DOS window and has feedback.

I do not have this problem here. There is no DOS window and I can capture the RedirectStandardError for the full output.