protected function leadSWF()
	{
		$exif  = exif_imagetype($this->file);
		$flash = ($exif === IMAGETYPE_SWF || $exif === IMAGETYPE_SWC);

		if ($exif)
		{
			return $this->closeCase("swf", "application/x-shockwave-flash");
		}

		return null;
	}