public function CabinetFileDownload($file_id)
 {
     // $file_id : IDType (== string == integer)
     $this->CheckAndSetHeader(__FUNCTION__);
     $reg_args["file_id"] = $file_id;
     $this->encodeString($reg_args);
     $results = parent::CabinetFileDownload($reg_args);
     $this->methodClose();
     return $results->file->content;
 }