To change this, just scroll down to “.mkv” on the left, and once selected, choose the corresponding application on the right that you’d like to set as the default. mkv files in Windows Media Player rather than the in-house Movies app.
Here you’ll be greeted by a two-tiered menu, the first containing every file type that Windows 10 is designed to handle, and the second with the list of apps you currently have installed on the machine. To choose which apps launch which types of media or link by the type of file, select the “Choose Default Apps by File Type” option. Overall, how you choose to organize your app commands is a matter of personal preference, but certain options such as “Default Apps by File Type” can usually tend to be a bit easier to manage for the average everyday user.
Though these are the original options you’ll find on a fresh install of Default Apps, you can always use the following options to customize exactly how Windows 10 will handle different requests based on the file type, the program, or an underlying launch protocol. The only command left up to you by default is Calendar links, which can be tied to your email provider or a third-party scheduling application that’s been installed at a later date.
