@lanodan @drewdevault didn't knew that about Windows too, but I woudn't be surprised.
In any case our interest to cover older versions from 5 to 20 years back more or less. I'm also considering if we could try targeting ReactOS or Wine, but I don't think we could guarantee it would work on Windows anyway. Similarly with Darling for macOS.
A computer that can run a new Windows or macOS version is already powerful enough to run mainstream browsers.