[O] org-export and open odt files always opened in emacs

[Amos Bird]

Greetings!

I'm trying to export and open odt files outside emacs. I've set
#+BEGIN_SRC elisp
 (setq org-file-apps
       `(("\\.org$" . emacs)
         ("\\.cpp$" . emacs)
         (t . ,(cond (IS-MAC "open -R \"%s\"")
                     (IS-LINUX "xdg-open \"%s\"")))))
#+END_SRC

However exported files are still opened inside emacs. What can I 
do?

regards,
Amos