Found in 2 comments on Hacker News
ndiddy · 2023-12-11 · Original thread
Not a course, but the best resource I've found for UI design is the Windows 2000 interface guidelines book: https://www.amazon.com/Microsoft-Windows-Experience-Professi... . It lays out everything (big and small) that made older Windows versions nice to use in an easy to digest format.
prezjordan · 2022-10-24 · Original thread
Good catch - You can probably tell which parts I took from Microsoft Windows User Experience [0] and which I built while eyeing my VM.

Unsure why there's a discrepancy. You're probably right re: taskbar buttons.

https://i.imgur.com/dxOYj2Y.png https://i.imgur.com/X3DJ50T.png

[0] https://www.amazon.com/Microsoft-Windows-Experience-Professi...