You're right, there's a stupid check against parameters on the version that
doesn't support the new flag.
Since from Windows 10, the Windows version checking is not recommended (and
not accurate) anymore, I think we can just retry if the function is called
with invalid parameters.
That will probably slow down the down-level Windows versions, but the
difference should not be too much.

On Thu, Aug 25, 2022 at 1:00 AM Eli Zaretskii <eliz@gnu.org> wrote:

> > From: Kiên Nguyễn Quang
> >  <kien.n.quang@gmail.com>
> > Date: Thu, 25 Aug 2022 00:33:58 +0900
> >
> > The CreateSymbolicLink Win32API has a flag that allows creating
> sym-links without admin privileges
> > SYMBOLIC_LINK_FLAG_ALLOW_UNPRIVILEGED_CREATE.
> > This patch added that support for w32 Emacs.
>
> Thanks, but we cannot use that flag unconditionally, because it is not
> supported on all Windows versions.  The addition of the flags should
> be conditioned on the version of Windows on which Emacs runs.
>