/usr/bin/sawfish-mate-session is in sawfish 1:1.11-2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | #!/bin/sh
xprop -root -remove _NET_NUMBER_OF_DESKTOPS \
-remove _NET_DESKTOP_NAMES \
-remove _NET_CURRENT_DESKTOP 2> /dev/null
export WINDOW_MANAGER=$(which sawfish)
exec $WINDOW_MANAGER &
sleep 0.1
exec mate-session $@
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