[racket] Why can't `Alt' be used as the Meta key in Windows?

Dear all,

Thank you for your fantastic support for Windows. It's an important reason
for me to choose Racket. Although I don't have a preference for Windows, I
have to work on Window. Many popular languages are quite unfriendly to
Windows.

I have a question here. `esc' is used as the Meta key for key bindings in
Windows, for example key `esc;c:k' for `M-C-k'. Why not use `Alt' key
instead? Is it because Windows captured these keys? It seems that `Alt'
works fine for Emacs on Windows.

Thanks and regards,
Ben
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