/usr/share/help/sl/glade/figures/main-window.png is in glade 3.16.1-0ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/help/sl/glade/figures/../../../C/glade/figures/main-window.png
/usr/share/help/sl/glade/figures/../../../C/glade/figures/main-window.png