I setup variable `org-link-frame-setup' like this:
  I want to let [C-c C-o] to open file link in current window.
 
  (setq org-link-frame-setup
      '((vm . vm-visit-folder-other-frame)
        (vm-imap . vm-visit-imap-folder-other-frame)
        (gnus . org-gnus-no-new-news)
        (file . find-file)
        (wl . wl-other-frame)))

   And I want to let [C-u C-c C-o] to open file link in *other* window.
   But upper setting can not do that.
   I do not know how to change this variable behavior to archive  this.

   Does anyone knows how to solve this problem ?