If you are looking for a deep dive into the associated with "Part 3," it typically refers to the third mission of the campaign, Retribution Aftermath , where players fight to retake Earth's Luna Gateway port.
: To access the contents, you must have all parts (part01 through the final number) in the same folder. You then extract only the first part (.part01), and the unarchiver automatically pulls data from the subsequent parts, including .part03. CallOfDutyInfiniteWarfare.part03.rar
: This is the third volume in a sequential series of RAR archives. On its own, it cannot be opened or played; it contains a middle chunk of the game's data, which might include campaign assets, multiplayer maps like Archive from the Continuum DLC, or Zombies content. If you are looking for a deep dive