use strict;
use warnings;

use Win32::API;

Win32::API->Import('kernel32.dll', 'LANGID GetSystemDefaultLangID()') or
  die "Can't import GetSystemDefaultLangID: $^E\n";

my $langid = GetSystemDefaultLangID();

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