/usr/share/gdm/autostart/LoginWindow/mythbuntu-gdm-settings-manager.desktop is in mythbuntu-gdm-theme 0.6-0ubuntu1.
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 | [Desktop Entry]
Type=Application
Name=Xfce Settings Daemon
TryExec=/usr/bin/xfsettingsd
Exec=/usr/bin/xfsettingsd
OnlyShowIn=GNOME;XFCE;
X-GNOME-Autostart-Phase=Initialization
X-GNOME-Autostart-Notify=true
X-GNOME-AutoRestart=true
|