1- Don't know what it is. What kind of file was it?

2. UI Dots are saved work display/screen setups. When you have your work area set up the way you want. Click one of those buttons and it waill save it. I have a few different setups depending on the image rez  eg - 600X800, 800X600, 1024X1024 and so on. I want the tools and lights set up for those work windows. With the saved dots, all I have to do is click one to get the setup I want..

To remove a dot, (ALT_Rightclick)

There are alsoPose and Camera dots, handy for saving Poses when working on clothroom, animations and so on. Same for the cameras.