public static function GetFile($fieldname, $b64encode = true, $ignore_empty = false, $max_kb = 0, $ok_types = null)
	{
		$fupload = self::GetFileUpload($fieldname, $ignore_empty, $max_kb, $ok_types);
		return ($fupload) ? $fupload->ToXML($b64encode) : null;
	}