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My own response at the time:

[...] it seem that this a generic Windows feature.
There is only one code VK_RETURN which is the keycode
reported by Tk.

MSDN says that WM_KEYDOWN sends an "extended key"
flag in its LPARAM (bit 24) that signifies keypad keys for the
usual keyboards. This could probably be used to construct
alternate keycodes and keysyms. [...]