A: Because the file handles Steam matchmaking. Even if the single-player campaign launches, multiplayer will fail without it.
A: No. Deleting it prevents the game from launching. You need a fresh copy via verification or restoration. call of duty infinite warfare steam-api64r.dll missing
A: This suggests an aggressive antivirus or a deeper Windows user account permission issue. Try creating a new Windows local admin account, installing Steam there, and testing the game. Conclusion The "steam-api64r.dll missing" error in Call of Duty: Infinite Warfare is a classic false-positive antivirus collision or a minor Steam client glitch. In 90% of cases, restoring the file from quarantine or running a Steam file verification will solve it instantly. A: Because the file handles Steam matchmaking
Do not panic and do not re-download 70 GB of data as your first step. Work methodically through Fixes 1 and 2 first. You will almost certainly be back to piloting the Jackal or pushing into the SDF fleet within ten minutes. Deleting it prevents the game from launching
If you found this guide helpful, share it with your squad. Happy hunting, Captain. Still stuck? Contact Steam Support or visit the r/InfiniteWarfare subreddit – search for "steam-api64r" for additional community-driven solutions.