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From: Alex Schroeder <alex@gnu.org>
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Subject: Gnus and Preview.app on a Mac
Date: Wed, 09 Oct 2013 22:58:06 +0200
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In an old message I saw Lars say, that using ~/.mailcap should do 
the trick. So I tried this:

application/pdf; open %s

When I look at my *Messages* buffer, I see the following:

Displaying open 
/var/folders/tv/tvbc\+bneEXWIKBV8nDtCXE\+\+\+TI/-Tmp-/emm.1878mQ/ZTS_Okt13.pdf...done

Then, nothing happens. When I check the path, I see no emm* 
directory.

alex@Pyrobombus:~$ ls 
/var/folders/tv/tvbc+bneEXWIKBV8nDtCXE+++TI/-Tmp-/
PreviewTemp-6d5jS3/ emacs501/           
docview501/         xcrun_db            

Something is not working correctly. Any ideas?

Cheers
Alex