The difference on Linux/BSD/macOS is that the Window Server is a userland application -- you can't depend on it existing (except macOS), nor can you depend on the underlying shell being consistent on a given OS/distribution (macOS ships with a deprecated bash shell and current zsh shell).

On Windows, Microsoft has it easy. The window server is part of the executive; Win32/conhost always exist, even if you choose to run another personality (OS/2, POSIX, et. al.).

I would bet that there is a form of graphical editor somewhere out there on the Internet that someone developed for fun for a given shell.

>You mean, there should be a GUI

That must have been what Microsoft was figuring back in the 20th century.

Even in the latest W11, it's the same basic everyday GUI as in Windows XP :)

Just a little more intuitive now.

In XP from the Control Panel click System > Advanced > Environment Variables.

In Win11 from Settings click System > About > Advanced System Settings > Environment Variables.

Pay attention to your choice of User PATH, in addition to System PATH.

Make sure that things like %HOMEDRIVE% that you edit in, actually appear as "C:" once you are done editing, or you're not doing it ideally.