Issue:

When calling `org-open-at-point' with the cursor on an internal link
to a directory, the directory is not opened in a new dired buffer and
the following message is printed in the minibuffer:

"Running less path/to/directory...done"

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Expected behavior:

A dired buffer is opened using the directory in the link.

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The following org bug report was generated when replicating the expected behavior:

Emacs  : GNU Emacs 26.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.18.9)
 of 2019-02-08
Package: Org mode version 9.1.9 (release_9.1.9-65-g5e4542 @ /usr/local/share/emacs/26.1/lisp/org/)

current state:
==============
(setq
 org-src-mode-hook '(org-src-babel-configure-edit-buffer org-src-mode-configure-edit-buffer)
 org-after-todo-state-change-hook '(org-clock-out-if-current)
 org-metadown-hook '(org-babel-pop-to-session-maybe)
 org-clock-out-hook '(org-clock-remove-empty-clock-drawer)
 org-mode-hook '(#[0 "\300\301\302\303\304$\207" [add-hook change-major-mode-hook org-show-block-all append local] 5]
#[0 "\300\301\302\303\304$\207" [add-hook change-major-mode-hook org-babel-show-result-all append local] 5]
org-babel-result-hide-spec org-babel-hide-all-hashes)
 org-archive-hook '(org-attach-archive-delete-maybe)
 org-confirm-elisp-link-function 'yes-or-no-p
 org-agenda-before-write-hook '(org-agenda-add-entry-text)
 org-metaup-hook '(org-babel-load-in-session-maybe)
 org-bibtex-headline-format-function #[257 "\300 \236A\207" [:title] 3 "\n\n(fn ENTRY)"]
 org-babel-pre-tangle-hook '(save-buffer)
 org-tab-first-hook '(org-babel-hide-result-toggle-maybe org-babel-header-arg-expand)
 org-occur-hook '(org-first-headline-recenter)
 org-cycle-hook '(org-cycle-hide-archived-subtrees org-cycle-hide-drawers org-cycle-show-empty-lines
 org-optimize-window-after-visibility-change)
 org-speed-command-hook '(org-speed-command-activate org-babel-speed-command-activate)
 org-confirm-shell-link-function 'yes-or-no-p
 org-link-parameters '(("id" :follow org-id-open) ("rmail" :follow org-rmail-open :store org-rmail-store-link)
      ("mhe" :follow org-mhe-open :store org-mhe-store-link) ("irc" :follow org-irc-visit :store org-irc-store-link)
      ("info" :follow org-info-open :export org-info-export :store org-info-store-link)
      ("gnus" :follow org-gnus-open :store org-gnus-store-link)
      ("docview" :follow org-docview-open :export org-docview-export :store org-docview-store-link)
      ("bibtex" :follow org-bibtex-open :store org-bibtex-store-link)
      ("bbdb" :follow org-bbdb-open :export org-bbdb-export :complete org-bbdb-complete-link :store
org-bbdb-store-link)
      ("w3m" :store org-w3m-store-link) ("file+sys") ("file+emacs") ("doi" :follow org--open-doi-link)
      ("elisp" :follow org--open-elisp-link) ("file" :complete org-file-complete-link)
      ("ftp" :follow (lambda (path) (browse-url (concat "ftp:" path)))) ("help" :follow org--open-help-link)
      ("http" :follow (lambda (path) (browse-url (concat "http:" path))))
      ("https" :follow (lambda (path) (browse-url (concat "https:" path))))
      ("mailto" :follow (lambda (path) (browse-url (concat "mailto:" path))))
      ("news" :follow (lambda (path) (browse-url (concat "news:" path)))) ("shell" :follow org--open-shell-link))
 )

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The following org bug report was generated when replicating the issue:

Emacs  : GNU Emacs 27.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.30)
 of 2019-12-14
Package: Org mode version 9.3 (release_9.3 @ /home/XXXX/emacs/lisp/org/)

current state:
==============
(setq
 org-src-mode-hook '(org-src-babel-configure-edit-buffer org-src-mode-configure-edit-buffer)
 org-link-shell-confirm-function 'yes-or-no-p
 org-metadown-hook '(org-babel-pop-to-session-maybe)
 org-clock-out-hook '(org-clock-remove-empty-clock-drawer)
 org-mode-hook '(#[0 "\300\301\302\303\304$\207" [add-hook change-major-mode-hook org-show-all append local] 5]
#[0 "\300\301\302\303\304$\207" [add-hook change-major-mode-hook org-babel-show-result-all append local] 5]
org-babel-result-hide-spec org-babel-hide-all-hashes)
 org-archive-hook '(org-attach-archive-delete-maybe)
 org-confirm-elisp-link-function 'yes-or-no-p
 org-agenda-before-write-hook '(org-agenda-add-entry-text)
 org-metaup-hook '(org-babel-load-in-session-maybe)
 org-bibtex-headline-format-function #[257 "\300 \236A\207" [:title] 3 "\n\n(fn ENTRY)"]
 org-babel-pre-tangle-hook '(save-buffer)
 org-tab-first-hook '(org-babel-hide-result-toggle-maybe org-babel-header-arg-expand)
 org-occur-hook '(org-first-headline-recenter)
 org-cycle-hook '(org-cycle-hide-archived-subtrees org-cycle-show-empty-lines org-optimize-window-after-visibility-change)
 org-speed-command-hook '(org-speed-command-activate org-babel-speed-command-activate)
 org-confirm-shell-link-function 'yes-or-no-p
 org-link-parameters '(("attachment" :follow org-attach-open-link :export org-attach-export-link :complete org-attach-complete-link)
      ("id" :follow org-id-open) ("eww" :follow eww :store org-eww-store-link)
      ("rmail" :follow org-rmail-open :store org-rmail-store-link)
      ("mhe" :follow org-mhe-open :store org-mhe-store-link)
      ("irc" :follow org-irc-visit :store org-irc-store-link :export org-irc-export)
      ("info" :follow org-info-open :export org-info-export :store org-info-store-link)
      ("gnus" :follow org-gnus-open :store org-gnus-store-link)
      ("docview" :follow org-docview-open :export org-docview-export :store org-docview-store-link)
      ("bibtex" :follow org-bibtex-open :store org-bibtex-store-link)
      ("bbdb" :follow org-bbdb-open :export org-bbdb-export :complete org-bbdb-complete-link :store
org-bbdb-store-link)
      ("w3m" :store org-w3m-store-link) ("file+sys") ("file+emacs") ("shell" :follow org-link--open-shell)
      ("news" :follow #[257 "\301\300\302 Q!\207" ["news" browse-url ":"] 5 "\n\n(fn URL)"])
      ("mailto" :follow #[257 "\301\300\302 Q!\207" ["mailto" browse-url ":"] 5 "\n\n(fn URL)"])
      ("https" :follow #[257 "\301\300\302 Q!\207" ["https" browse-url ":"] 5 "\n\n(fn URL)"])
      ("http" :follow #[257 "\301\300\302 Q!\207" ["http" browse-url ":"] 5 "\n\n(fn URL)"])
      ("ftp" :follow #[257 "\301\300\302 Q!\207" ["ftp" browse-url ":"] 5 "\n\n(fn URL)"])
      ("help" :follow org-link--open-help) ("file" :complete org-link-complete-file)
      ("elisp" :follow org-link--open-elisp) ("doi" :follow org-link--open-doi))
 org-link-elisp-confirm-function 'yes-or-no-p
 )