/usr/share/doc/xmms2-plugin-mpg123/NEWS.Debian.gz is in xmms2-plugin-mpg123 0.8+dfsg-14build3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/xmms2-plugin-mpg123/../xmms2-core/NEWS.Debian.gz