Dired integration `gnus-dired-minor-mode’ installs key bindings in dired buffers to send a file as an attachment (`C-c C-a’), open a file using the approriate mailcap entry (`C-c C-f’), and print a file using the mailcap entry (`C-c P’). It is enabled with

(add-hook ‘dired-mode-hook ‘turn-on-gnus-dired-mode)