This file is indexed.

/usr/share/themes/Opta/xfwm4/themerc is in xfwm4-themes 4.10.0-2.

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

The actual contents of the file can be viewed below.

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active_text_color=#FFFFFF
button_offset=1
button_spacing=2
full_width_title=true
title_horizontal_offset=0
title_vertical_offset_active=1
title_vertical_offset_inactive=1
title_shadow_active=true
title_shadow_inactive=false