[OS X Emacs] Use "Open" command in Dired Mode

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    >> I get the error message: Symbol's value as variable is void:
    >> dired-mode-map.  Is the tip outdated?

    David> Maybe try something like (require 'dired) before evaluating this?

Also, I think you might need (dired-get-filename) instead of
(dired-get-file-for-visit), at least you do in XEmacs.

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