static private function setMimeType()
	{
		$UserBrowser = '';
		if( preg_match( '@Opera(/| )([0-9].[0-9]{1,2})@', $_SERVER['HTTP_USER_AGENT'] ) )
			$UserBrowser = "Opera";
		elseif( preg_match( '@MSIE ([0-9].[0-9]{1,2})@', $_SERVER['HTTP_USER_AGENT'] ) )
			$UserBrowser = "IE";
		$mime_type = ( $UserBrowser == 'IE' || $UserBrowser == 'Opera' ) ? 'application/octetstream' : 'application/octet-stream';
		header( "Content-Type: ". $mime_type);
	}