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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: abbreviate-file-name on Windows seems incorrect
Date: Sat, 06 Jan 2007 16:18:16 +0200
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> Date: Sat, 06 Jan 2007 12:37:25 +0100
> From: "Lennart Borgman (gmail)" <lennart.borgman@gmail.com>
> Cc: Emacs-Devel <emacs-devel@gnu.org>
> 
> If leave abbreviated-home-dir as "^c:/\\(/\\|\\'\\)" and you instead 
> just comment out this part in abbreviate-file-name, does it works as you 
> expect then? :
> 
> 	       ;; MS-DOS root directories can come with a drive letter;
> 	       ;; Novell Netware allows drive letters beyond `Z:'.
> 	       (not (and (or (eq system-type 'ms-dos)
> 			     (eq system-type 'cygwin)
> 			     (eq system-type 'windows-nt))
> 			 (save-match-data
> 			   (string-match "^[a-zA-`]:/$" filename)))))

Why remove it?  It does on Windows what the preceding fragment (the
one you didn't show) does on Unix.