If you are looking for the exact directory name or "NFO" associated with that specific .rar file, it is often tied to older or PROPHET releases. You can verify specific release history on databases like PreDB.me or SceneP2P by searching for the exact file size or CRC32 checksum.
: The original 2005 base game release.
Based on historical scene database records, common release names associated with Age of Empires III include: AgeOfEmpires3Games.rar
: The second expansion pack.