Try this

use strict;
use warnings;

use Win32::API::Prototype;

ApiLink( 
    'kernel32.dll', 
    'LONG GetSystemDefaultLangID( VOID )'
) or die "Can't import GetSystemDefaultLangID: $^E\n";

my $langid = GetSystemDefaultLangID( 0 );

if (defined $langid) {
  print "Returned '$langid'\n";
  printf "Lang ID: 0x%04X\n", $langid;
}
else {
  print "Returned <undef>\n";
}
__END__
P:\test>test3
Returned '2011563017'
Lang ID: 0x77E60409
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