/usr/share/icons/mate-window-applets/Radiant-MATE/index.theme is in ubuntu-mate-icon-themes 18.04.11.
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 16 17 18 19 20 21 22 23 24 25 26 27 | [Icon Theme]
Name = Radiant-MATE
Comment = Radiant-MATE theme for WindowButtons
# Directory list
Directories=close,minimize,maximize
[close]
Context=close
Size=19
MinSize=8
MaxSize=512
Type=Scalable
[minimize]
Context=minimize
Size=19
MinSize=8
MaxSize=512
Type=Scalable
[maximize]
Context=maximize
Size=19
MinSize=8
MaxSize=512
Type=Scalable
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