Hi there.
Have your new Windows installed, but you want to customize the behavior of the OS.
Let’s say you don’t want the Metro style apps to open you pictures.
So just open your metro style start menu or press WIN+W and type default. You should see the “Default Programs” app.
Open it and edit your defaults.
In case you are wondering … Yes you could just get here through the control panel. I just find this way faster.
Enjoy.