Here are the rsponses:

(file-name-all-completions "" "/mnt/heg")
("../" "./")


(file-name-all-completions "" "/mnt/heg/data")
("../")


(find-file-name-handler "/mnt/heg"
			'file-name-all-completions)
nil


(find-file-name-handler "/mnt/heg/data"
			'file-name-all-completions)
nil

The /mnt/heg/folders are mounted. ls -lt /mnt/heg/data yields a list of
about 20 folders. 

I do not know if I already provided it, but here are the contents of
.xemacs/custom.el:

(custom-set-variables
 '(desktop-enable t nil (desktop))
 '(display-time-24hr-format t)
 '(fill-column 70)
 '(filladapt-turn-on-mode-hooks (quote (text-mode-hook)))
 '(gnuserv-frame (quote gnuserv-main-frame-function)))


(custom-set-faces
 '(default ((t (:size "15pt" :family "Liberation.Mono" :foreground
"black" :background "wheat"))) t))


;; (custom-set-faces
;;  '(default ((t (:size "15pt" :family "Liberation.Mono" :foreground
"wheat" :background "darkslategrey"))) t))


Thanks.