/usr/share/themes/Shiny/xfwm4/themerc is in mate-themes 1.9.2-1.
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 10 11 12 13 14 15 | active_text_color=#ffffff
button_offset=0
button_spacing=2
maximized_offset=0
shadow_delta_height=0
shadow_delta_width=0
shadow_delta_x=0
shadow_delta_y=2
show_app_icon=true
title_height=23
title_horizontal_offset=0
title_shadow_active=frame
title_shadow_inactive=false
title_vertical_offset_active=0
title_vertical_offset_inactive=0
|