http://valinet6l6tq6d5yohaa6gdsf2ho4qcqcxyj2nahp5kd4z7nsa6ycdqd.onion/2022/05/24/Set-default-apps-in-Windows-11.html
Instead of the good old Settings - Apps - Default apps page from Windows 10 that easily let you assign an app for an entire category (which is pretty logical, for example, you could set the default music player in a pinch, which immediatly associated the app with mp3, wav etc files), you now have to go through each extension and assign it the app that you want, or go to the app and manually assign each extension to it.