In Windows 10, app installers cannot associate apps directly with file types. Instead, when you open any file which can be opened by multiple programs on your PC, you get a Metro-style toast notification: You have new apps that can open this type of file. If you click it, a new dialog will appear. There you can choose the default program that you would like to use for the file or protocol type. If you want to disable the "You have new apps installed" notifcation in Windows 10, here are a few simple steps for you.
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