When I use the site:domain.com command in Google I notice that for some strange reason they are indexing my directory folder urls, such as: http://www.domain.com/files/ http://www.domain.com/files/photos/ I want them to index the images within these folders, however, I don't want them to include the directory folder urls in Google Search. Can I take care of this via robots.txt? If so how would I do this?