[da_grift_shift]

UWP, one of the 10+ frameworks used to run Windows 11's system components. Wonderful! Exemplary!

https://old.reddit.com/r/Windows11/comments/o2a0kp/there_are...

[Rohansi]

Those are design languages/styles, not frameworks. There is a fewer number of frameworks but it's still a handful. Win32, WPF, UWP, MAUI, etc... but at least they're fairly consistent at using UWP for system UI, with older bits using Win32 still.