public function CabinetGetFileInfo($arg)
 {
     // $arg : IDType (not array)
     $this->CheckAndSetHeader(__FUNCTION__);
     $reg_args["hid"] = $arg;
     $this->encodeString($reg_args);
     $results = parent::CabinetGetFileInfo($reg_args);
     $this->methodClose();
     return $this->decodeString($results->file_information);
 }