/usr/share/gtk-doc/html/libmatewnck/ is in libmatewnck-doc 1.6.1-3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gtk-doc/html/libmatewnck/MatewnckApplication.html
/usr/share/gtk-doc/html/libmatewnck/MatewnckClassGroup.html
/usr/share/gtk-doc/html/libmatewnck/MatewnckPager.html
/usr/share/gtk-doc/html/libmatewnck/MatewnckScreen.html
/usr/share/gtk-doc/html/libmatewnck/MatewnckSelector.html
/usr/share/gtk-doc/html/libmatewnck/MatewnckTasklist.html
/usr/share/gtk-doc/html/libmatewnck/MatewnckWindow.html
/usr/share/gtk-doc/html/libmatewnck/MatewnckWorkspace.html
/usr/share/gtk-doc/html/libmatewnck/core.html
/usr/share/gtk-doc/html/libmatewnck/home.png
/usr/share/gtk-doc/html/libmatewnck/index.html
/usr/share/gtk-doc/html/libmatewnck/index.sgml
/usr/share/gtk-doc/html/libmatewnck/indexes.html
/usr/share/gtk-doc/html/libmatewnck/intro.html
/usr/share/gtk-doc/html/libmatewnck/ix01.html
/usr/share/gtk-doc/html/libmatewnck/ix02.html
/usr/share/gtk-doc/html/libmatewnck/ix03.html
/usr/share/gtk-doc/html/libmatewnck/ix04.html
/usr/share/gtk-doc/html/libmatewnck/ix05.html
/usr/share/gtk-doc/html/libmatewnck/ix06.html
/usr/share/gtk-doc/html/libmatewnck/ix07.html
/usr/share/gtk-doc/html/libmatewnck/ix08.html
/usr/share/gtk-doc/html/libmatewnck/ix09.html
/usr/share/gtk-doc/html/libmatewnck/ix10.html
/usr/share/gtk-doc/html/libmatewnck/ix11.html
/usr/share/gtk-doc/html/libmatewnck/ix12.html
/usr/share/gtk-doc/html/libmatewnck/ix13.html
/usr/share/gtk-doc/html/libmatewnck/left.png
/usr/share/gtk-doc/html/libmatewnck/libmatewnck-Miscellaneous-Functions.html
/usr/share/gtk-doc/html/libmatewnck/libmatewnck-Resource-Usage-of-X-Clients.html
/usr/share/gtk-doc/html/libmatewnck/libmatewnck-Version-Information.html
/usr/share/gtk-doc/html/libmatewnck/libmatewnck-Window-Action-Menu.html
/usr/share/gtk-doc/html/libmatewnck/libmatewnck.devhelp2
/usr/share/gtk-doc/html/libmatewnck/right.png
/usr/share/gtk-doc/html/libmatewnck/style.css
/usr/share/gtk-doc/html/libmatewnck/up.png
/usr/share/gtk-doc/html/libmatewnck/utils.html
/usr/share/gtk-doc/html/libmatewnck/widgets.html