Surely, if Windows is open source, we can port Wine to it and run all the win32 executables we want? Wine already runs old Windows programs better than Windows does.
[1]: https://www.youtube.com/watch?v=vPnehDhGa14
EDIT: TO be clear, this is a video of upgrading to Windows 7, and there is a direct upgrade path to 10 from 7. Also, as per another user's reply, this doesn't hold true for 64-bit. However, that doesn't change the fact that Wine doesn't and really can't run win32 better than win32 does.
Not on x86_64.
https://superuser.com/questions/140953/why-cant-a-64-bit-os-...
I maintain that Windows is always a better choice for running win32 applications, unless you don't have that option. I'll also note that I'm not saying Wine is useless, or anything along those lines. I merely take issue with the idea that it runs win32 applications "better" than a system that's designed to be backwards compatible with win32 applications by the same entity that made win32.