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It has to be executed with [http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/cscript_overview.mspx cscript.exe] (a command-line version of the Windows Script Host) or [http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/sag_wshtopnode.mspx wscript.exe] (the Windows-based script host) like below:
'''cscript \\path\to\wpkg.js [flags]'''