That’s cool! Windows’ backwards compatibility is amazing. It also allows for feature detection so a program can work on 3.11 but also look and feel native on 10.
I played around with that here: https://github.com/sjmulder/netwake
It’s a simple utility but it works on Windows 3.11 (with Win32s) and up, but supporting high DPI, font scaling, and theming on Windows versions that support it.