When you get a new computer running Windows 10, one of the first things you'll want to do is to set your default applications. These settings control which of your applications and programs will open what kinds of files. This may not sound like a big deal at first, but users who upgrade to Windows 10 often find that they don't like the default web browser, email application, PDF viewer, or video player that Microsoft has chosen for them. Watch the video below to see how you can take control over what applications open files on your PC.