/usr/share/themes/RedmondXP/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.
1 2 3 4 5 6 7 8 9 10 11 12 | active_text_color=#FFFFFF
button_layout=O|HMC
button_offset=2
button_spacing=3
full_width_title=false
maximized_offset=4
show_app_icon=true
title_alignment=left
title_shadow_active=true
title_shadow_inactive=false
title_vertical_offset_active=3
title_vertical_offset_inactive=3
|