'P' and 'N' are constants defined in Win32::API, not strings. The third parameter to new Win32::API should be an anonymous list or an array reference, not a string literal 
                     'GetTimeZoneInformation',
                      [P],
                      N

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FWIW, according to the documentation, string literals are allowed for specifying the types of the parameters.

In reply to Re: Re: pack()ing Win32 Structures by mothra
in thread pack()ing Win32 Structures by mothra

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