how to fail on valid zip file

[Jeffrey Bacon]

During my build process, I want to test a file to see if it is a valid 
ZIP file.  However, I want to FAIL if it IS valid and succeed if it is 
NOT valid.  Is there some way I can do this with the unzip task?
--
Jeffrey Bacon
[EMAIL PROTECTED]
Creative Developer
http://www.magmic.com

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