Hello,

I think that since its recent rewrite, `org-open-at-point' adds 'file+'
before the name of the application before trying to find the correct
application.

For example the following link:
#+BEGIN_EXAMPLE
[[docview:foo.pdf]]
#+END_EXAMPLE
won't trigger the `org-docview-open' handler
because the following code:
#+BEGIN_SRC emacs-lisp
(or (let ((app (org-element-property :application context)))
			 (nth 1 (assoc (concat "file" (and app (concat "+" app)))
				       org-link-protocols)))
		       #'org-open-file)
#+END_SRC
adds `file+' and then search in `org-link-protocols'.

-- 
Daimrod/Greg