+(defvar ls-lisp-use-insert-directory-program nil
+ "Non-nil causes ls-lisp to revert back to using `insert-directory-program'.
+This is useful on platforms where ls-lisp is dumped into Emacs, such as
+Microsoft Windows, but you would still like to use a program to list
+the contents of a directory.")
+
+;; Remember the original insert-directory function.
+(fset 'original-insert-directory (symbol-function 'insert-directory))
+
+(defun insert-directory (file switches &optional wildcard full-directory-p)
+ "Insert directory listing for FILE, formatted according to SWITCHES.
+Leaves point after the inserted text.
+SWITCHES may be a string of options, or a list of strings.
+Optional third arg WILDCARD means treat FILE as shell wildcard.
+Optional fourth arg FULL-DIRECTORY-P means file is a directory and
+switches do not contain `d', so that a full listing is expected.
+
+This version of the function comes from `ls-lisp.el'. Depending upon
+the value of `ls-lisp-use-insert-directory-program', it will use an
+external program if non-nil or the lisp function `ls-lisp-insert-directory'
+otherwise."
+ (if ls-lisp-use-insert-directory-program
+ (original-insert-directory file switches wildcard full-directory-p)
+ (ls-lisp-insert-directory file switches wildcard full-directory-p)))
+
+(defun ls-lisp-insert-directory (file switches &optional wildcard full-directory-p)