AutoCAD 2013 :: Open And Save Preferences

I'm taking the Basics training coarse and while doing exercises something changed in my Open and Save preferences.  As far as I know I didn't do anything to make the change.  It used to be when I clicked on the "Open File" button a window with a visual tree would open on screen and I could visually go through my files, opening sub folders until I found the file I wanted.  The "save" and "save as" buttons worked the same. 

Now, instead of the window with visual map, I get a command line where I'm asked to type in the destination and name of the file.