/usr/share/kde4/apps/messageviewer/ is in libmessageviewer4 4:4.13.0-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/kde4/apps/messageviewer/longurlServices.json
/usr/share/kde4/apps/messageviewer/messageviewer.notifyrc
/usr/share/kde4/apps/messageviewer/plugins/
/usr/share/kde4/apps/messageviewer/plugins/bodypartformatter/
/usr/share/kde4/apps/messageviewer/plugins/bodypartformatter/application_ms-tnef.desktop
/usr/share/kde4/apps/messageviewer/themes/
/usr/share/kde4/apps/messageviewer/themes/example/
/usr/share/kde4/apps/messageviewer/themes/example/header.desktop
/usr/share/kde4/apps/messageviewer/themes/example/header.html
/usr/share/kde4/apps/messageviewer/themes/example/header_row.html
/usr/share/kde4/apps/messageviewer/themes/example_fancy/
/usr/share/kde4/apps/messageviewer/themes/example_fancy/header.desktop
/usr/share/kde4/apps/messageviewer/themes/example_fancy/header.html