Here are some specific examples of how the update improved gameplay:
Here's a story for you:
Upon inspection, the file seems to be a legitimate patch for Ninja Gaiden Sigma 2, with the version number indicating it's an update to the game. CODEX is a well-known group in the gaming community for releasing cracked games and patches. Ninja.Gaiden.Sigma.2.Update.v1.0.0.2-CODEX.rar
To clarify: