: The signature of the "release group." CODEX was one of the most prominent and prolific groups in the PC gaming world, known for "cracking" Digital Rights Management (DRM) software to make games playable without official authentication.
: The specific versioning, indicating this is a revision of the base game. R.B.I.Baseball.21.Update.v1.00.54118-CODEX.rar
B.I. Baseball franchise or more about the ? : The signature of the "release group