Comment 9 for bug 324105

My C# and Launchpad knowledge are limited, but I created a branch of gnome-do-plugins that includes an option to limit the files indexed in a specified path by a list of extensions. I believe you need to be using the latest dev build of gnome-do (r1362). My branch is located here: https://code.launchpad.net/~mjs7231/do-plugins/file-and-folders-improvements

Here is a screenshot showing what I am talking about:
http://imgur.com/npOid