/usr/share/doc/tcl-vtk6/changelog.Debian.gz is in tcl-vtk6 6.0.0-6.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/tcl-vtk6/../libvtk6/changelog.Debian.gz
/usr/share/doc/tcl-vtk6/../libvtk6/changelog.Debian.gz