/usr/share/gnome-session/sessions/openbox-gnome.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.
1 2 3 4 5 6 7 8 9 | [GNOME Session]
Name=GNOME/Openbox
RequiredComponents=gnome-settings-daemon;
# Try load with the gnome-panel and use the fallback if we can't load a panel
RequiredProviders=windowmanager;panel
DefaultProvider-windowmanager=openbox
DefaultProvider-panel=gnome-panel
FallbackSession=openbox-gnome-fallback
DesktopName=GNOME
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