Black Ops 3 Steam-api64.dll Error =link= < Direct Bundle >

Because steam-api64.dll hooks deep into system processes to talk to Steam, many aggressive antivirus programs (McAfee, Norton, Avast, and even Windows Defender) flag it as a "PUP" (Potentially Unwanted Program) or a false-positive Trojan.

Add the Black Ops 3 game folder to your antivirus Exclusions list to prevent this from happening again. 2. Verify Integrity of Game Files black ops 3 steam-api64.dll error

This is the official fix recommended by Steam and Treyarch. It forces Steam to scan your installation folder and re-download any missing or corrupted files, including steam-api64.dll . Because steam-api64

Published: April 18, 2026