/usr/share/gnome/wm-properties/metacity-wm.desktop is in metacity-common 1:3.18.3-1ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | [Desktop Entry]
Type=Application
Name=Metacity
Exec=metacity
# name of loadable control center module
X-GNOME-WMSettingsModule=metacity
# name we put on the WM spec check window
X-GNOME-WMName=Metacity
# back compat only
X-GnomeWMSettingsLibrary=metacity
X-GNOME-Bugzilla-Bugzilla=GNOME
X-GNOME-Bugzilla-Product=metacity
X-GNOME-Bugzilla-Component=general
X-GNOME-Autostart-Phase=WindowManager
X-GNOME-Provides=windowmanager
X-GNOME-Autostart-Notify=true
X-Ubuntu-Gettext-Domain=metacity
[Window Manager]
SessionManaged=true
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