New to Opera. Using v20. How do I change what it does with a certain kind of file, to download it or open it with a program? I see things in the http://www.opera.com/help/tutorials/personalize/ area that I can't find in my browser. "Settings" only has "Browser, Websites, Privacy & Security" I don't see "Preferences" "quick preferences" or "appearance" or other things referred to in the tutorials.