bug#58464: 28.1; browse-url-emacs doesn't work for local files on Windows

[Eli Zaretskii]

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> From: Pascal Quesseveur <pquessev@gmail.com>
> Date: Wed, 12 Oct 2022 12:31:20 +0200
> 
> >"EZ" == Eli Zaretskii <eliz@gnu.org> writes:
> 
>   EZ> With Emacs 29, I get a different message:
> 
>   EZ>   Use M-x make-directory RET RET to create the directory and its
>   EZ>   parents
> 
> But does the first call with 2 slashes work with Emacs 29?

It doesn't hang as with Emacs 28, but it is broken in a slightly
different way: *Messages* says the same, but buffer-file-name is
X:/Windows/win.ini (i.e. the C: drive letter was lost), and
default-directory is accordingly X:/Windows.