This file is indexed.

/usr/share/mate/autostart/mate-optimus.desktop is in mate-optimus 18.04.0-1.

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]
Name=MATE NVIDIA Optimus
Comment=Shows a tray icon when a compatible NVIDIA Optimus graphics card is detected
Exec=/usr/lib/mate-optimus/mate-optimus-applet
Icon=optimus-tray-nvidia
Terminal=false
Type=Application
Categories=GTK;GNOME;Settings;
StartupNotify=false