/usr/lib/gambas3/gb.desktop.so is in gambas3-gb-desktop 3.1.1-2.2ubuntu4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/gambas3/gb.desktop.so.0.0.0
/usr/lib/gambas3/gb.desktop.so.0.0.0