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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: coding problem char \217 etc
Date: Fri, 16 Nov 2018 19:23:47 +0200
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In-reply-to: <877ehdrnew.fsf@mat.ucm.es> (message from Uwe Brauer on Fri, 16
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> From: Uwe Brauer <oub@mat.ucm.es>
> Cc: Uwe Brauer <oub@mat.ucm.es>, emacs-devel@gnu.org
> Date: Fri, 16 Nov 2018 17:35:03 +0100
> 
> But still wondering why 
> 
> (decode-coding-region (region-beginning) (region-end) 'mac-roman)
> 
> Does not work.

In "emacs -Q" or in your customized Emacs?

Besides, you should invoke this after visiting the file literally ,
with find-file-literally.  After "C-x C-f", it's too late, because the
file is already decoded.