Exclude Path Not Working

I recently added Moon to my movie library, and I ripped the special features as well and put them in a subfolder. Usually it doesn't matter to XBMC whether they're there or not, but this one was different. I told it to scan my library for new stuff. It recognized Moon just fine, but it recognized the making-of documentary special feature as "Still Making Moonshine". I thought "No big deal" and told XBMC to "Exclude path from library updates" on the special features folder. It doesn't work. Every time I do a library update it tries to load that special feature incorrectly into my library. Is there some other way to tell it to ignore that folder?

Oh. I'm using the latest stable release, not Frodo.