From mboxrd@z Thu Jan  1 00:00:00 1970
From: Bastien <bzg@altern.org>
Subject: Re: org-export-as-html-and-open problem
Date: Tue, 05 Feb 2013 00:29:05 +0100
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	(zhenjiang xu's message of "Mon, 4 Feb 2013 16:24:04 -0700")
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To: zhenjiang xu <zhenjiang.xu@gmail.com>
Cc: emacs-orgmode@gnu.org

zhenjiang xu <zhenjiang.xu@gmail.com> writes:

> Thanks, Bastien. It's the default value - I've not changed it:
>
> org-file-apps is a variable defined in `org.el'.
> Its value is ((auto-mode . emacs)
>  ("\\.mm\\'" . default)
>  ("\\.x?html?\\'" . default)
>  ("\\.pdf\\'" . default))

So you need to check the relevant variable:

org-file-apps-defaults-gnu
org-file-apps-defaults-macosx
org-file-apps-defaults-windowsnt

If the relevant variable uses the defaults (as I guess),
you need to configure the mailcap file for your system

See http://en.wikipedia.org/wiki/Mailcap

HTH,

-- 
 Bastien