/usr/share/wordnet/pixmaps/wn.xbm is in wordnet-gui 1:3.0-33.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/wordnet/pixmaps/../wnres/wn.xbm
/usr/share/wordnet/pixmaps/../wnres/wn.xbm