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https://support.microsoft.com/en-us/windows/change-default-programs-in-windows-10-e5d...

On the Start menu, select Settings > Apps > Default apps. Select which default you want to set, and then choose the app. You can also get new apps in Microsoft Store. Apps need to be installed before you can set them as the default.

https://answers.microsoft.com/en-us/windows/forum/all/windows-10-default-apps/813b9282...

I have a Dell Inspiron 5558 on Windows 10 21H1 that has taken to resetting the default apps to Microsoft apps on every boot. I have tried the registry entry fixes that I have found and none of them work. It resets all the default apps - browser, photos, music etc. The system is up to date on Cumulative Updates on both Windows and .NET.

https://docs.microsoft.com/en-us/windows/win32/shell/vista-managing-defaults

For applications, using the per-user scope provided by the Default Programs APIs offers the following advantages: No Elevation. An application does not have to elevate its privileges to claim defaults. Good Citizenship. On a multiple-user computer, each user can select different default applications. Default Management

https://support.microsoft.com/en-us/windows/change-which-programs-windows-7-uses-by...

A default program is the program that Windows uses when you open a particular type of file, such as a music file, an image, or a webpage. For example, if you have more than one web browser installed on your computer, you can choose one of them to be the default browser.