It's odd. The value of org-file-apps-defaults-gnu is:

((remote . emacs) (system . mailcap) (t . mailcap))

And I checked my local mime file, which shows google-chrome is the default
app to open html files:

$ cat ~/.local/share/applications/mimeapps.list
[Added Associations]
application/epub+zip=FBReader.desktop;
application/pdf=pdf.desktop;
application/vnd.rn-realmedia=smplayer.desktop;
application/x-matroska=smplayer.desktop;
application/x-mimearchive=firefox.desktop;
application/x-ole-storage=libreoffice-impress.desktop;
audio/mpeg=audacious.desktop;
text/html=google-chrome.desktop;
video/mpeg=gnome-mplayer.desktop;
x-scheme-handler/mailto=google-chrome.desktop;KMail2.desktop;

[Default Applications]
text/html=google-chrome.desktop
x-scheme-handler/mailto=google-chrome.desktop

Any idea?

On Mon, Feb 4, 2013 at 4:29 PM, Bastien <bzg@altern.org> wrote:

> 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
>