This file is indexed.

/usr/share/gnome-session/sessions/openbox-gnome-fallback.session is in openbox-gnome-session 3.5.2-8+deb8u1.

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

The actual contents of the file can be viewed below.

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[GNOME Session]
Name=GNOME/Openbox fallback (Safe Mode)
RequiredComponents=gnome-settings-daemon;
RequiredProviders=windowmanager;
DefaultProvider-windowmanager=openbox
DesktopName=GNOME