know why although registered some file extensions for search are grayed out

In the Settings section i am wondering why all options are not available with this registered version?

Link to screen shot below:

http://i156.photobucket.com/albums/t28/duranmr/Untitled-2.jpg

http://i156.photobucket.com/albums/t28/duranmr/Untitled-4.jpg

I tried to circle in red the items that I am talking about Thank you