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From: Gregory Chernov <greg@visiontech-dml.com>
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Subject: gnus mime external display question
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Hi,

I always wanted to read archived attachments (tar, zip etc.)
inside gnus/xemacs. Maybe I'm reinventing the wheel but
simplest way do it for me is to use gnuclient.
I added new type to mailcap-mime-data:

("gnuclient"
  (viewer . "gnuclient %s")
  (type   . "application/gnuclient")
  (test   . (eq (mm-device-type) 'x))
  ("needsx11"))


and now with "view as type" application/gnuclient
I can browse tar/zip attachments inside xemacs.

Only problem is when I close client, temporary files
/tmp/emm.* are not deleted. 

Maybe somebody who understands how external display 
in gnus is worked can help me with this problem or
at least say in which gnus files/functions I should
look to solve it.