I noticed all my screenshots were useless cause I saved the Renders as a .BMP how to change this extension?

Also I noticed a lot of people talking about AA what is that and what setting do I need for that. Pls post direction to these settings like this.

(simple Windows linking in this case but in topic i ment POV-Ray style)

Do like this:

Open Windows Explorer>Go to Options>Select INternet Options>Now you can cgange the homepage.

Ty for those who will help me.