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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Zipped image file
Date: Sat, 07 Sep 2019 13:21:01 +0300
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> From: Paul Eggert <eggert@cs.ucla.edu>
> Date: Fri, 6 Sep 2019 14:24:02 -0700
> Cc: emacs-devel@gnu.org
> 
> On 9/6/19 2:04 PM, Angelo Graziosi wrote:
> > Suppose one uses bzip2 to compress a PNG file, foo.png ---> foo.png.bzip2. Visiting this file, Emacs says that cannot display the image because cannot determine the image type.
> 
> I see similar symptoms, but the display works as expected if the file is 
> named foo.png.bz2.

You mean, you see the image?  If so, I suspect this might be because
your Emacs is built with ImageMagick.