From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jambunathan K <kjambunathan@gmail.com>
Subject: bug#14605: bug#14605: Problem with export an .org file to .pdf does
 not open pdf file
Date: Mon, 02 Sep 2013 14:04:14 +0530
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	Dominik's message of "Mon, 2 Sep 2013 07:35:40 +0200")
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To: Carsten Dominik <carsten.dominik@gmail.com>
Cc: Petr Hracek <phracek@redhat.com>, 14605@debbugs.gnu.org

Carsten Dominik <carsten.dominik@gmail.com> writes:

> They are basically the "open" commands for MacOS X and Windows, and
> mailcap for Unix/Linux.

The suggestion below is met with some approval in the Orgmode mailist
earlier.  

http://lists.gnu.org/archive/html/emacs-orgmode/2013-07/msg00407.html

Here I go.
----------------------------------------------------------------

Turn `org-file-apps-defaults-gnu' (which is now a defconst) in to
defcustom and make xdg-open the default (or make a drop down list with
gnome-open, kde-open for people who don't have xdg-utils insalled) .

    (defconst org-file-apps-defaults-gnu
      '((remote . emacs)
        (system . mailcap)
        (t . mailcap))
      "Default file applications on a UNIX or GNU/Linux system.
    See `org-file-apps'.")


    (custom-set-variables
     '(org-file-apps
       (quote
        ((auto-mode . emacs)
         ("\\.mm\\'" . default)
         ("\\.x?html?\\'" . default)
         ("\\.pdf\\'" . default))))
     '(org-file-apps-defaults-gnu
       (quote
        ((remote . emacs)
         (system . "xdg-open %s")
         (t . mailcap))) t))

----------------------------------------------------------------

Anyways, opening a file outside of Emacs is not specific to Org.  Other
applications can open facility, if available right within Emacs core.

For some discussion surrounging - `open-file' - see
http://debbugs.gnu.org/cgi/bugreport.cgi?bug=14110