This may not be of great help, but I've always used Win32::API a bit differently, (not importing) which worked for me. You're out there in no mans land with Win32::API for the most part, doc/example-wise, so I hope you have some C under you belt. Try packing up your stuff proper, minus the typedefs, and just shove it in there.
Warning: you may have to sacrifice livestock or perform some strange ritual in a musty basement in order to get everything working.
-vlad
my $FileTimeToSystemTime = new Win32::API('Kernel32.dll', 'FileTimeToS
+ystemTime',['P','P'],'I');
sub FileTimeToSystemTime {
my $filetime=shift;
my $systemtime="\0" x (2*8);
$FileTimeToSystemTime->Call($filetime, $systemtime) or return;
return unpack( 'S8', $systemtime);
}