protected static function _getList($type) {
        $types = array();

        foreach (self::$_types as $ext => $mimeType) {
            if (is_array($mimeType)) {
                $mimeType = $mimeType[0];
            }

            if (strpos($mimeType, $type) === 0) {
                $types[$ext] = $mimeType;
            }
        }

        return $types;
    }