From mboxrd@z Thu Jan  1 00:00:00 1970
From: Joe Riel <joer@san.rr.com>
Subject: Re: Specify page number in hyperlink [to pdf]
Date: Fri, 30 Apr 2010 10:23:06 -0700
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To: nicholas.dokos@hp.com
Cc: emacs-orgmode@gnu.org

Nick Dokos wrote:
> Joe Riel <joer@san.rr.com> wrote:
>
>   
>> That is fine, though I'll apply the patch.  There does appear to
>> be another bug, or my misunderstanding.  That is, even
>> without the link,
>>
>>  [[file:/home/joe/sample.pdf]]
>>
>> does not work properly.  That is, clicking on it (mouse 1)
>> opens the pdf inside emacs rather than in a standalone pdf reader.
>> Previously
>> that wasn't the case (if memory serves).  Using
>>
>>  [[file:/home/joe/sample.pdf::1]]
>>
>> for the link opens it in a standalone reader.
>>
>>
>>     
>
> Probably because you have an explicit setting for the latter in
> org-file-apps (as Jan suggested) but not for the former. There are many
> twisty passages here, but I think that in the end emacs looks at your
> mailcap: if it finds no match there then it opens it itself.
>
> I have 
>
> application/pdf; xpdf -q %s
>
> in my ~/.mailcap and indeed the link opens in xpdf.
>
>   
My /etc/mailcap defines an appropriate application for pdfs.
The problem is that I replaced the existing entry
for pdf in org-file-apps, so that without the page tag there is no match.

Doing

(setq org-file-apps '((auto-mode . emacs)
             ("\\.mm\\'" . default)
             ("\\.x?html?\\'" . default)
             ("\\.pdf::\\([0-9]+\\)\\'" . "evince \"%s\" -p %1")
             ("\\.pdf\\'" . default)   ;; this was the original
             ))

allows links to pdf's without the page tag to open in an external 
application.