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From: Richard Stallman <rms@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: C file recoginzed as image file
Date: Mon, 08 Jan 2007 00:32:43 -0500
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    > The reason I decided to detect images by their contents
    > rather than by their file names is that it seems more correct
    > as a way of recognizing them.

    Why does it seem that way to you?

The whole point of a magic number is to recognize the file type
from its contents, regardless of file name.