Look for a recent "Threat blocked" or "Severe" block event matching the date you tried to launch Black Ops 3.
Reboot after completion, then verify game files again.
Encountering the error when trying to launch Call of Duty: Black Ops 3 is a frustrating, yet surprisingly common, issue for PC gamers. This error usually manifests as a pop-up window stating that the program cannot start because the file is missing from your computer, urging you to reinstall the program.
Download and install both the and x64 versions of the latest Visual C++ Redistributables . Restart your computer. Summary of Solutions Look for a recent "Threat blocked" or "Severe"
Sometimes the issue lies within the Steam client itself, not the game. Reinstalling Steam can fix issues with the steam_api64.dll file location. Close .
, you generally need to restore the file from quarantine or verify your game files through Steam. Antivirus software often flags this specific DLL as a threat and removes it automatically. Top Solutions How To Fix steam_api64.dll Missing From Games - 2025
: This is the most reliable way to redownload the missing file through Steam. Steam Library Right-click Call of Duty: Black Ops III and select Properties Installed Files tab and click This error usually manifests as a pop-up window
Visit the official Microsoft website and download the .
Navigate to the official Microsoft page to download the latest Visual C++ Redistributable Packages.
To fix the steam_api64.dll missing error in , you should first verify your game files through Steam or check if your antivirus has quarantined the file. 1. Verify Integrity of Game Files Summary of Solutions Sometimes the issue lies within
Locate steam_api64.dll (or related file) and select .
“Error: steamapi64.dll not found.”
The steamapi64.dll missing error in Black Ops 3 is almost always a false positive by antivirus software or a minor Steam glitch. Start with Method 1 (Verify Integrity). In 9 out of 10 cases, that single click will have you back in the game within five minutes. Happy hunting, soldiers.
Move your steamapps folder back into the new Steam directory to avoid re-downloading your games. Critical Safety Warning
Since antivirus software is the most common cause, this is the first and simplest check.