2017-11-10 19:52 GMT+01:00 Eli Zaretskii <eliz@gnu.org>:

> > From: phillip.lord@russet.org.uk (Phillip Lord)
> > Date: Fri, 10 Nov 2017 17:01:39 +0000
> > Cc: jostein@kjonigsen.net, emacs-devel@gnu.org
> >
> > >  I suggest we instead use the user's profile folder. From an initial
> > >  probe, this can be found in at least the following
> > >  environment-variables on my Windows 10 test-machine: USERPROFILE (or
> > >  by concatenating HOMEDRIVE and HOMEPATH ).
> >
> > I'll fix this.
>
> Just to make this more complex: the Windows platform conventions frown
> upon installing stuff in that directory; you are supposed to create a
> subdirectory and install there.
>
> And programs should not end up there, they should be under
> %ProgramFiles% instead.  The user's directory is for files, not for
> programs.
>

That are the recommendations, yes. But I have never installed stuff like
Emacs or TeX (or others)
in %ProgramFiles%.
And neither Cygwin or MSYS2 install in this directory.
You are still free to install stuff in c:\Gnu is you chose to do so.

Fabrice