/usr/share/applications/mate-session-logout.desktop is in mate-gnome-main-menu-applet 1.8.0-5build1.
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 | [Desktop Entry]
Name=Session Logout Dialog
Comment=Prompt the user to log out of their session
Exec=mate-session-save --logout-dialog
Terminal=false
Type=Application
Icon=system-log-out
Hidden=true
Categories=Application;System;
Keywords=MATE;session;logout;
OnlyShowIn=MATE;
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