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  1. or download this
    use Win32API::Registry qw(:ALL);

...
  RegQueryValueEx($key, "MachineGuid", [], $type, $nodeId, []);
  RegCloseKey( $key );
}
  2. or download this
    #define KEY_WOW64_64KEY 0x0100
    Access a 64-bit key from either a 32-bit or 64-bit application.