/usr/share/app-install/desktop/gtk-theme-config:gtk-theme-config.desktop is in app-install-data 15.10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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X-AppInstall-Package=gtk-theme-config
X-AppInstall-Popcon=141
X-AppInstall-Section=universe
Name=Theme Configuration
GenericName=Theme Configuration
Comment=Configure GTK theme colors
Exec=gtk-theme-config
Terminal=false
Type=Application
Icon=gtk-theme-config
Categories=GNOME;GTK;Settings;DesktopSettings;X-XFCE-SettingsDialog;X-XFCE-PersonalSettings;
Keywords=color;gtk;highlight;theme;widget;
X-GNOME-Gettext-Domain=gtk-theme-config
X-Ubuntu-Gettext-Domain=app-install-data
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