/usr/share/games/freeciv/civ2civ3.serv is in freeciv-data 2.5.10-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | # Server commands to make Civ2Civ3 Freeciv rules
#
rulesetdir civ2civ3
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