/usr/share/a11y-profile-manager/profiles/high-contrast/mate.gsettings is in mate-accessibility-profiles 0.1.11-0ubuntu4.
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 | [org.mate.interface]
icon-theme="HighContrast"
monospace-font-name="monospace 18"
font-name="sans 18"
[org.mate.peripherals-mouse]
cursor-size=48
cursor-theme="whiteglass"
[org.mate.background]
picture-filename=""
primary-color="#666666"
secondary-color="#7F7F7F"
color-shading-type="solid"
|