/usr/bin/sdm-wm is in sdm 0.4.1-4.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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#/usr/bin/sdm-wm
# Copyright 2003, 2004 Vagrant Cascadian <vagrant@freegeek.org>.
# Licensed under the terms of the GNU General Public License,
# version 2 or any later version.
# TODO support window managers not in the debian alternatives 
# system
if [ -r ~/.sdmrc ]; then
    . ~/.sdmrc
fi
# check the debian alternatives system for available window managers
availablewm=$(/usr/sbin/update-alternatives --display \
    x-window-manager | awk '{print $1}' | egrep bin)
if [ -r /etc/sdm/windowmanagers ]; then
    availablewm="$availablewm $(egrep -v ^# /etc/sdm/windowmanagers | awk -F "=" '{print $2}')"
fi
wmlist=
for wm in $availablewm; do
    if [ -x "$wm" ]; then
        wmlist="FALSE $(basename $wm) $wm $wmlist"
    fi
done
if [ -n "$(which wmanager)" ]; then
    wmanager="FALSE wmanager $(which wmanager)"
fi
if [ -n "$(which selectwm)" ]; then
    selectwm="FALSE selectwm $(which selectwm)"
fi
windowmanager=$(zenity --list --radiolist \
    --title="which window manager would you like to try?" \
    --column="" --column="Name" --column="Description" \
    TRUE default "default window manager" \
    $wmlist \
    $wmanager \
    $selectwm \
    FALSE sdm-wm "sdm window manager selection" \
    FALSE browse "browse for window manager")
if [ "0" != "$?" ]; then
    xmessage -center "cancel pressed, exiting..."
    exit 1
fi
if [ "browse" = "$windowmanager" ]; then
    windowmanager=$(zenity --file-selection --title"Select windowmanager" --filename="/usr/bin")
    if [ ! -x "$windowmanager" ]; then
        windowmanager=
    fi
fi
zenity --question \
    --title="confirm selected windowmanager" \
    --text="Would you like to set $windowmanager as your \
    default window manager?"
if [ "0" = "$?" ]; then
    echo "windowmanager=$windowmanager" > ~/.sdmrc
fi
if [ "sdm-wm" = "$windowmanager" ]; then
    exec sdm-wm
fi
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