07-214858.el

(require 'recentf)
(require 'dired-open)
  ;;;###autoload
(defun my-add-recentf-in-dired ()
  "Add a file to the recentf list when you try to open the file using dired-open.el."
  (interactive)
  (let ((file (dired-get-filename)))
    (when file
      (recentf-add-file file)))
  nil)
(add-hook 'dired-open-functions 'my-add-recentf-in-dired)
(add-to-list 'recentf-used-hooks '(dired-open-functions my-add-recentf-in-dired))