/usr/share/doc/guile-gnome2-gtk/examples/guile-gtk-demo/demos/ is in guile-gnome2-gtk 2.16.2-1.1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/guile-gnome2-gtk/examples/guile-gtk-demo/demos/appwindow.scm
/usr/share/doc/guile-gnome2-gtk/examples/guile-gtk-demo/demos/button-box.scm
/usr/share/doc/guile-gnome2-gtk/examples/guile-gtk-demo/demos/continuations.scm
/usr/share/doc/guile-gnome2-gtk/examples/guile-gtk-demo/demos/dialog.scm
/usr/share/doc/guile-gnome2-gtk/examples/guile-gtk-demo/demos/editable-cells.scm
/usr/share/doc/guile-gnome2-gtk/examples/guile-gtk-demo/demos/entry-completion.scm
/usr/share/doc/guile-gnome2-gtk/examples/guile-gtk-demo/demos/list-store.scm
/usr/share/doc/guile-gnome2-gtk/examples/guile-gtk-demo/demos/menus.scm
/usr/share/doc/guile-gnome2-gtk/examples/guile-gtk-demo/demos/panes.scm
/usr/share/doc/guile-gnome2-gtk/examples/guile-gtk-demo/demos/sizegroup.scm
/usr/share/doc/guile-gnome2-gtk/examples/guile-gtk-demo/demos/tree-model.scm
/usr/share/doc/guile-gnome2-gtk/examples/guile-gtk-demo/demos/tree-store.scm
/usr/share/doc/guile-gnome2-gtk/examples/guile-gtk-demo/demos/ui-manager.scm