/usr/lib/libstrigihtmlgui.so.0 is in libstrigihtmlgui0 0.7.8-1.2+b2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/libstrigihtmlgui.so.0.7.8
/usr/lib/libstrigihtmlgui.so.0.7.8