There are several distinct reasons why you might suddenly encounter this issue on your PC:
If Fix 1 worked, but the error returns the next time you reboot, your antivirus is eating the DLL. You need to tell Windows to leave it alone. call of duty infinite warfare steamapi64rdll missing work
: Modern security software often flags game DLLs as "suspicious" and moves them to quarantine without notice. Report: Fixing "SteamAPI64
The steam_api64.dll is missing error in Call of Duty: Infinite Warfare is almost never a missing file—it is a blocked, quarantined, or misregistered one. In 2026, Windows Defender is smarter but more aggressive, and overlays are more intrusive than ever. Step 3 — Ensure Steam is up to