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I have Emacs installed with brew install emacs-mac --HEAD --with-cocoa --with-gnutls --with-librsvg --with-imagemagick. I have the final .app binary in the OS X Dock.

If I drag a file onto the Dock icon, the default behavior opens it in the last-activated frame, even if it is on a different desktop. I'd like files to open in a new frame in the current desktop when drag-and-dropped onto the icon. Is this behavior possible? Yes, because this is emacs. Can anyone suggest a place to begin implementing this?

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    I don't use the Brew or dropping stuff in Dock icons, but I have looked into altering ns-find-file so that files opened from the Finder.app get displayed in certain select frames (using a custom function and let-binding the display-buffer-alist). Why not try adding a message to ns-find-file and drop your file on the Dock and see if the message gets displayed? If it does, then "Bingo!". If not, then "Go Fish!". Here is a link to a modified version of ns-find-file: stackoverflow.com/questions/18346785/… – lawlist Jul 7 '16 at 16:39
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Until someone suggest a better implementation, I over-write dnd-open-local-file to open in a new frame instead of a new window:

(setq dnd-open-file-other-frame t)    
(defun dnd-open-local-file (uri _action)
  (let* ((f (dnd-get-local-file-name uri t)))
    (if (and f (file-readable-p f))
    (progn
      (if dnd-open-file-other-frame
          (find-file-other-frame f)
        (find-file f))
      'private)
      (error "Can not read %s" uri))))
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