/usr/share/doc/gtk-3-examples/examples/application4/ is in gtk-3-examples 3.10.8-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/gtk-3-examples/examples/application4/Makefile.am
/usr/share/doc/gtk-3-examples/examples/application4/Makefile.in.gz
/usr/share/doc/gtk-3-examples/examples/application4/app-menu.ui
/usr/share/doc/gtk-3-examples/examples/application4/exampleapp.c
/usr/share/doc/gtk-3-examples/examples/application4/exampleapp.gresource.xml
/usr/share/doc/gtk-3-examples/examples/application4/exampleapp.h
/usr/share/doc/gtk-3-examples/examples/application4/exampleappwin.c
/usr/share/doc/gtk-3-examples/examples/application4/exampleappwin.h
/usr/share/doc/gtk-3-examples/examples/application4/main.c
/usr/share/doc/gtk-3-examples/examples/application4/resources.c.gz
/usr/share/doc/gtk-3-examples/examples/application4/window.ui