Hi,
You can configure the application with which you can open certain types of files from the GUI.
Right-click on the file type that you would always want to open in Windows Media Player, click Open with, click Choose default program, and then select Windows Media Player to set it as default for the selected file type.
In Windows 10 you won’t be able to configure file mapping through the registry.
If you would like to change file association via GPO, this policy named Set a default associations configuration file is located under Computer Configuration -> Administrative Templates -> Windows Components ->File Explorer.
You may refer to the following link for details:
http://woshub.com/managing-default-file-associations-in-windows-10/#h2_4
Note: This is a third-party link and we do not have any guarantees on this website. And Microsoft does not make any guarantees about the content.
Hope above information can help you.