/usr/share/doc/libgwengui-qt4-0/changelog.Debian.gz is in libgwengui-qt4-0 4.20.0-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libgwengui-qt4-0/../libgwenhywfar60/changelog.Debian.gz