The Zenphoto part of these rewrite rules reads as follows:

Check the URL to be a file or a directory. If it is, just load the URL. If it is not, redirect to the root index.php script.

If not the above then do the other rewrite rules. But of course, there is no way that you would ever get to these rules because the URL will either point to a file/folder or it will redirect to the index.php script.