You double-click on a file, and a default app kicks in to open it. But what if the app which runs isn’t the one you want, and there’s a program you’d prefer to take over the duties of automatically opening said file format.

Fortunately, it’s easy to change this. Just right click on the file in question, then select ‘Open with’ and from the resulting fly-out menu you can choose the program you really want to open that particular format.