/usr/share/games/plugins/xboard/fairymax.eng is in fairymax 4.8v-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | plugin spec 0.0
fairymax
chess,capablanca,seirawan,fairychess,shatranj,asean
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