Thanks for your help. After a bit of work here's what I learned. The trick to getting roksbox to work is, you need to make sure that you choose the PHP setting to get your directory structure, put your media files in your Qweb folder, and use the file the videoxml.php file to make the directory structure. I found it difficult to find on the web, so I'm making it available here. -->
http://ugtv.org/Roku/videoxml.php.
Keep in mind that I added .avi to possible file formats. As far as I can tell Roku doesn't support AVI, so this won't work, but it will show AVI files if you have them in your folder structure. This file will display nesting folders, so you only need to place it at the root level of your video folder structure.
If you need to add other file types, look in the videoxml.php file at line 114. They are listed here : if ( preg_match("/.(\.avi|\.mp4|\.m4v|\.mkv|\.mov|\.wmv|\.ts|\.m3u8|\.pxml)$/i", $path) ) {