/usr/share/myspell/dicts/gd-GB.aff is in myspell-gd 0.50-11.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/myspell/dicts/../../hunspell/gd_GB.aff
/usr/share/myspell/dicts/../../hunspell/gd_GB.aff