/usr/share/appstream/templates/default/ is in appstream-generator 0.6.8-2build2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/appstream/templates/default/base.html
/usr/share/appstream/templates/default/issues_index.html
/usr/share/appstream/templates/default/issues_page.html
/usr/share/appstream/templates/default/main.html
/usr/share/appstream/templates/default/metainfo_index.html
/usr/share/appstream/templates/default/metainfo_page.html
/usr/share/appstream/templates/default/section_page.html
/usr/share/appstream/templates/default/sections_index.html
/usr/share/appstream/templates/default/static/
/usr/share/appstream/templates/default/static/css/
/usr/share/appstream/templates/default/static/css/highlight.css
/usr/share/appstream/templates/default/static/css/style.css
/usr/share/appstream/templates/default/static/img/
/usr/share/appstream/templates/default/static/img/asgen.png
/usr/share/appstream/templates/default/static/img/cpt-nogui.png
/usr/share/appstream/templates/default/static/img/favicon.png
/usr/share/appstream/templates/default/static/img/no-image.png
/usr/share/appstream/templates/default/static/js/
/usr/share/appstream/templates/default/static/js/flot
/usr/share/appstream/templates/default/static/js/highlight/
/usr/share/appstream/templates/default/static/js/highlight/highlight.pack.js
/usr/share/appstream/templates/default/static/js/jquery/
/usr/share/appstream/templates/default/static/js/jquery/jquery.min.js