WinZip Command Line Support Add-on return codes have not been developed to a satisfactory degree. It is often the case that one return code can indicate more than one possibility. Return codes will not be distributed unless or until their reliability has been determined.
WZZIP and WZUNZIP will in most cases return a nonzero errorlevel in the event of a serious error; otherwise, an errorlevel of 0 is returned. You can use these return codes in batch files and other automated processing.
Piping the display output of your command to a log file may be helpful for troubleshooting. See the article How to create a log file when using WinZip Command Line Support Add-on.
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