This file is indexed.

/usr/share/mate/wm-properties/compiz.desktop is in compiz-mate 1:0.9.13.1+18.04.20180302-0ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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[Desktop Entry]
Type=Application
Name=Compiz
Exec=compiz
NoDisplay=true
# name of loadable control center module
X-GNOME-WMSettingsModule=compiz
# autostart phase
X-GNOME-Autostart-Phase=WindowManager
X-GNOME-Provides=windowmanager
# name we put on the WM spec check window
X-GNOME-WMName=compiz
# back compat only 
X-GnomeWMSettingsLibrary=compiz
X-Ubuntu-Gettext-Domain=compiz