/usr/share/gtk-doc/html/libgwymodule/ is in libgwyddion20-doc 2.26-1ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gtk-doc/html/libgwymodule/ModuleLibrary.html
/usr/share/gtk-doc/html/libgwymodule/ModuleTutorial.html
/usr/share/gtk-doc/html/libgwymodule/PluginProxyReference.html
/usr/share/gtk-doc/html/libgwymodule/gwymodule-tutorial-beyond.html
/usr/share/gtk-doc/html/libgwymodule/gwymodule-tutorial-file.html
/usr/share/gtk-doc/html/libgwymodule/gwymodule-tutorial-graph.html
/usr/share/gtk-doc/html/libgwymodule/gwymodule-tutorial-install.html
/usr/share/gtk-doc/html/libgwymodule/gwymodule-tutorial-layer.html
/usr/share/gtk-doc/html/libgwymodule/gwymodule-tutorial-minimal.html
/usr/share/gtk-doc/html/libgwymodule/gwymodule-tutorial-overview.html
/usr/share/gtk-doc/html/libgwymodule/gwymodule-tutorial-process.html
/usr/share/gtk-doc/html/libgwymodule/gwymodule-tutorial-tool.html
/usr/share/gtk-doc/html/libgwymodule/home.png
/usr/share/gtk-doc/html/libgwymodule/index.html
/usr/share/gtk-doc/html/libgwymodule/index.sgml
/usr/share/gtk-doc/html/libgwymodule/left.png
/usr/share/gtk-doc/html/libgwymodule/libgwymodule-gwymodule-file.html
/usr/share/gtk-doc/html/libgwymodule/libgwymodule-gwymodule-graph.html
/usr/share/gtk-doc/html/libgwymodule/libgwymodule-gwymodule-layer.html
/usr/share/gtk-doc/html/libgwymodule/libgwymodule-gwymodule-process.html
/usr/share/gtk-doc/html/libgwymodule/libgwymodule-gwymodule-tool.html
/usr/share/gtk-doc/html/libgwymodule/libgwymodule-gwymodulebrowser.html
/usr/share/gtk-doc/html/libgwymodule/libgwymodule-gwymoduleenums.html
/usr/share/gtk-doc/html/libgwymodule/libgwymodule-gwymoduleloader.html
/usr/share/gtk-doc/html/libgwymodule/libgwymodule.devhelp2
/usr/share/gtk-doc/html/libgwymodule/plugin-proxy-dump.html
/usr/share/gtk-doc/html/libgwymodule/plugin-proxy-file.html
/usr/share/gtk-doc/html/libgwymodule/plugin-proxy-overview.html
/usr/share/gtk-doc/html/libgwymodule/plugin-proxy-process.html
/usr/share/gtk-doc/html/libgwymodule/plugin-proxy-rgi.html
/usr/share/gtk-doc/html/libgwymodule/right.png
/usr/share/gtk-doc/html/libgwymodule/style.css
/usr/share/gtk-doc/html/libgwymodule/up.png