* lisp/dired-aux.el (dired-do-open): New command (bug#18132).

* lisp/dired.el (dired-context-menu): Bind 'dired-do-open' to "Open".

* lisp/dired-aux.el (shell-command-guess-xdg): Use 'shell-quote-argument'.

etc/NEWS

@@ -511,6 +511,10 @@ based on marked files in Dired.  Possible backends are
 and a universal command such as "open" or "start"
 that delegates to the OS.
 
+*** New command 'dired-do-open'.
+Bound to the context menu "Open", delegates opening the marked files
+to the OS.
+
 ** Ediff
 
 ---

lisp/dired-aux.el

@@ -1367,7 +1367,8 @@ after adding own commands to the composite list."
   (let* ((xdg-mime (when (executable-find "xdg-mime")
                      (string-trim-right
                       (shell-command-to-string
-                       (concat "xdg-mime query filetype " (car files))))))
+                       (concat "xdg-mime query filetype "
+                               (shell-quote-argument (car files)))))))
          (xdg-mime-apps (unless (string-empty-p xdg-mime)
                           (xdg-mime-apps xdg-mime)))
          (xdg-commands
@@ -1401,6 +1402,39 @@ after adding own commands to the composite list."
   "Populate COMMANDS by the `open' command."
   (append (ensure-list shell-command-guess-open) commands))
 
+(declare-function w32-shell-execute "w32fns.c")
+
+(defun dired-do-open (&optional arg)
+  "Open the marked files or a file at click/point externally.
+If files are marked, run the command from `shell-command-guess-open'
+on each of marked files.  Otherwise, run it on the file where
+the mouse is clicked, or on the file at point."
+  (interactive "P" dired-mode)
+  (let ((files (if (mouse-event-p last-nonmenu-event)
+                   (save-excursion
+                     (mouse-set-point last-nonmenu-event)
+                     (dired-get-marked-files nil arg))
+                 (dired-get-marked-files nil arg)))
+        (command shell-command-guess-open))
+    (when (and (memq system-type '(windows-nt))
+               (equal command "start"))
+      (setq command "open"))
+    (when command
+      (dolist (file files)
+        (cond
+         ((memq system-type '(gnu/linux))
+          (call-process command nil 0 nil file))
+         ((memq system-type '(ms-dos))
+          (shell-command (concat command " " (shell-quote-argument file))))
+         ((memq system-type '(windows-nt))
+          (w32-shell-execute command (convert-standard-filename file)))
+         ((memq system-type '(cygwin))
+          (call-process command nil nil nil file))
+         ((memq system-type '(darwin))
+          (start-process (concat command " " file) nil command file))
+         (t
+          (error "Open not supported on this system")))))))
+
 
 ;;; Commands that delete or redisplay part of the dired buffer
 

lisp/dired.el

@@ -2591,6 +2591,9 @@ Do so according to the former subdir alist OLD-SUBDIR-ALIST."
     ["Delete Image Tag..." image-dired-delete-tag
      :help "Delete image tag from current or marked files"]))
 
+(declare-function shell-command-guess "dired-aux" (files))
+(defvar shell-command-guess-open)
+
 (defun dired-context-menu (menu click)
   "Populate MENU with Dired mode commands at CLICK."
   (when (mouse-posn-property (event-start click) 'dired-filename)
@@ -2606,6 +2609,9 @@ Do so according to the former subdir alist OLD-SUBDIR-ALIST."
            :help "Edit file at mouse click"]
           ["Find in Other Window" dired-mouse-find-file-other-window
            :help "Edit file at mouse click in other window"]
+          ,@(when shell-command-guess-open
+              '(["Open" dired-do-open
+                 :help "Open externally"]))
           ,@(when commands
               (list (cons "Open With"
                           (append