/usr/share/games/freeciv/experimental.serv is in freeciv-data 2.3.2-1+deb7u1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | # Server commands to start with an experimental ruleset
# Use this as, eg, "./ser -r data/experimental.serv"
rulesetdir experimental
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