How to stop Visual Studio from opening a file on single click?

Question

In my Visual Studio 2012 Solution Explorer, when I single click a filename it opens it. This was different from Visual Studio 2010 (required a double click). Is there a way

Answer 1

Shortcut Ctrl+Alt+Home.

If you press that in a document that was just opened, it will be opened permanently.

Item -> right click -> Open With -> Source Code (Text) Editor -> press Set as Default button