This file is indexed.

/usr/share/themes/Ozone3/index.theme is in lubuntu-artwork-12-04 0.71.

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

The actual contents of the file can be viewed below.

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[Desktop Entry]
Name=lubuntu
Type=X-GNOME-Metatheme
Comment=Default theme for Lubuntu 12.04 Precise Pangolin

[X-GNOME-Metatheme]
GtkTheme=lubuntu
IconTheme=lubuntu
CursorTheme=DMZ-Black
CursorSize=24
NotificationTheme=ubuntu