print $Config{ archname };;
MSWin32-x64-multi-thread

$n = 0x12345678;;
print unpack 'C*', pack 'V', $n;;
120 86 52 18

print unpack 'C*', pack 'NV', $n;;
18 52 86 120 0 0 0 0

print unpack 'C*', pack 'N', $n;;
18 52 86 120

print unpack 'C*', pack 'Q<', $n;;
120 86 52 18 0 0 0 0

print unpack 'C*', pack 'Q>', $n;;
0 0 0 0 18 52 86 120