rxvt in windowmaker

[homega@vlc.servicom.es]

Hi,

how can I have a console program opened running in a rxvt as in an x-term on
windowmaker?

ie.  I have the following in menu.hook:

"Mutt"  EXEC xterm  -T "Mutt" -e /usr/bin/mutt

how can have the same program opened with rxvt instead?
  
"Mutt"  EXEC rxvt  -d "Mutt" -e /usr/bin/mutt

and other combinations haven't worked so far.

TIA

Horacio
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