/usr/lib/x86_64-linux-gnu/libmate-window-settings.so.1 is in libmate-window-settings1 1.8.3+dfsg1-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libmate-window-settings.so.1.0.0