I previously wrote this solution: https://emacs.stackexchange.com/questions/38345/open-an-external-sketch-drawing-application 

to make svg links open in inkscape, even if they don't already exist.

I wanted to try using org-file-apps for this:

#+BEGIN_SRC emacs-lisp
(defun my-svg (path link)

  (message "path: %s - %s" path link))

(add-to-list 'org-file-apps '("\\.svg\\'" . my-svg))
#+END_SRC

but i 
John

-----------------------------------
Professor John Kitchin 
Doherty Hall A207F
Department of Chemical Engineering
Carnegie Mellon University
Pittsburgh, PA 15213
412-268-7803