# text/html; firefox %s; test=test -n "$DISPLAY"; nametemplate=%s.html
# text/html; w3m -I %{charset} -T text/html; copiousoutput;
# application/pdf; mutt_bgrun evince '%s'; test=test -n "$DISPLAY"; nametemplate=%s.pdf
# image/jpeg; eog %s
# image/png; eog %s
# application/vnd.openxmlformats-officedocument.wordprocessingml.document; mutt_bgrun soffice %s; test=sh -c 'test $DISPLAY'