Registration of Vim executable on Windows

Hello, all

How are the Vim executables regitered on Windows so that
they are always available from the command prompt even
though no environment variable seems to contain their path? On
my PC, for example, Vim's executables are installed at

C:\Program Files\Vim\vim80

but

set | grep vim

does show anything. How does Windows locate vim.exe,
gvim.exe when I invoke them from the command line?

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