diff --git a/emacs/init.org b/emacs/init.org
index d7c56af..f22b847 100755
--- a/emacs/init.org
+++ b/emacs/init.org
@@ -1555,8 +1555,12 @@ Include a timestamp when TODO entries are closed:
 Tell Emacs how to open file links of various types:
 #+BEGIN_SRC emacs-lisp
   (with-eval-after-load 'org
-    (add-to-list 'org-file-apps '(directory . emacs))
-    (add-to-list 'org-file-apps '("log" . emacs)))
+    (setq org-file-apps '(("log" . emacs)
+                          (auto-mode . emacs)
+                          (directory . emacs)
+                          ("\\.pdf\\'" . emacs)
+                          ("\\.mm\\'" . default)
+                          ("\\.x?html?\\'" . default))))
 #+END_SRC
 
 A function to add ids to every heading in an Org file: