It does this through file associations, where a program or app has been set as the default for that file type. Windows 10 opens different file types using a particular program. One thing that you should know about Windows 10, is that it automatically assigns default apps for all file formats and actions, like playing an MP3 File or a Document. Now we that are settling comfortably in to Windows 10, it is time to look into the finer aspects in the new operating system.Locate the file extension for which you want to. Scroll down a little and select Choose default apps by file type. How to Change File Associations in Windows 10 Right-click the Start button (or hit the WIN+X hotkey) and choose Settings.Select the Always use the selected program to open this kind of file check box. In the Open With dialog box, click the program with which you want the file to open, or click Browse to locate the program that you want. To change file associations: Right-click a file with the extension whose association you want to change, and then click Open With.
