/usr/share/games/openttd/baseset/opengfx/changelog.txt.gz is in openttd-opengfx 0.5.4-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/games/openttd/baseset/opengfx/../../../../doc/openttd-opengfx/changelog.gz