Don't rename attachments when forwarding

[John Robot]

Hello,

I've noticed that, when forwarding (C-c C-f) a mail to other
people, the attached files are renamed into something like
`attXXX...' where XXX is a number.

How is it possible to get rid of that feature (under Gnus
5.10.6)?

,----[ Extract of my .gnus ]
|
| ;; when forwarding mail, chop off these headers
| (setq message-forward-ignored-headers
|       (concat "^\\("
|               "Content-Class\\|Delivered-To\\|Importance\\|In-Reply-To\\|"
|               "Lines\\|Message-Id\\|Organization\\|Received\\|References\\|"
|               "Return-Path\\|Return-Receipt-To\\|Sender Thread-Index\\|"
|               "Thread-Topic\\|User-Agent\\|X.*"
|               "\\):"))
| 
| ;; subject of article with 'Fwd:' prepended to it, for forwarded messages
| (setq message-make-forward-subject-function 'message-forward-subject-fwd)
| 
| ;; forwarded messages will just be copied inline to the new message
| (setq message-forward-as-mime nil)
`----

Best regards & Many thanks,
  John

-- 
John Robot