use Win32API::Registry qw(:ALL);

...

if( RegOpenKeyEx( HKEY_LOCAL_MACHINE, "SOFTWARE\\Microsoft\\Cryptography", 0, KEY_READ|0x0100, $key ) ) {
  RegQueryValueEx($key, "MachineGuid", [], $type, $nodeId, []);
  RegCloseKey( $key );
}

##</code><code>##

#define KEY_WOW64_64KEY 0x0100
	Access a 64-bit key from either a 32-bit or 64-bit application.