This file is indexed.

/usr/share/games/freeciv/multiplayer/nations.ruleset is in freeciv-data 2.4.2-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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; Modifying this file:
; You should not modify this file except to make bugfixes or
; for other "maintenance".  If you want to make custom changes
; you should create a new datadir subdirectory and copy this file
; into that directory, and then modify that copy.  Then use the
; command "rulesetdir <mysubdir>" in the server to have freeciv
; use your new customized file.

; Use default nations.ruleset.
*include "default/nations.ruleset"