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From: Erik Colson <eco@ecocode.net>
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Subject: Re: How to change default PDF viewer?
Date: Tue, 25 Aug 2015 18:37:57 +0200
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Nikolaus Rath <Nikolaus@rath.org> writes:

> Can someone tell me how to change the default PDF viewer from Emacs' new
> internal document viewer to an external program?

which OS are you on ?
-- 
erik colson