/usr/lib/x86_64-linux-gnu/libt3window.so.0 is in libt3window0 0.3.0-1build2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libt3window.so.0.0.0
/usr/lib/x86_64-linux-gnu/libt3window.so.0.0.0