To prevent your antivirus from deleting the re-downloaded file again, you must add the game directory to your security software's exclusion list. Open > Virus & threat protection .
If the file is listed as "Threat Quarantined," select > Restore .
Press the , type Windows Security , and hit Enter . Click on Virus & threat protection . Select Protection history .
The steam_api64.dll file is a crucial library file developed by Valve that allows games to interface with the Steam client—handling functions like achievements, user authentication, and DRM. When it goes missing, BO3 cannot verify the game's legitimacy or connect to Steam properly. To prevent your antivirus from deleting the re-downloaded
Steam can automatically detect and redownload missing system files. Open your . Right-click Call of Duty: Black Ops III . Select Properties > Installed Files . Click Verify integrity of game files . Wait for Steam to replace the missing DLL. Reinstall DirectX and Visual C++ Redistributables
Place the downloaded steam_api64.dll directly into the game's main installation folder (usually located at C:\Program Files (x86)\Steam\steamapps\common\Call of Duty Black Ops III ).
Many outdated tutorials tell you to download DLLs from third-party sites or to run sketchy “registry cleaners.” Black Ops 3 in 2024 is still actively played, but it relies on legacy Steam API hooks. The “verified” methods above are the only ones officially recommended by Steam and Treyarch support. Press the , type Windows Security , and hit Enter
completion. It will repair broken system pathways affecting game launches. Summary of Fixes Best Used For Success Rate Time Required Steam users with accidental file deletions 5–10 mins Antivirus Restoration Users running mods, patches, or custom clients Visual C++ Repair Engine initialization errors & system crashes SFC Scan Deep Windows registry file system corruption 🛠️ Verification Confirmations Fix Confirmed
If nothing works, your Windows installation may be corrupted – consider a repair install or contacting .
Right-click on and select Properties . Go to the Installed Files (or Local Files) tab. The steam_api64
Locate the , Vault , or Protection History section. Search for steam_api64.dll .
How to Fix Steamapi64r.dll Missing Error in Black Ops 3 The steamapi64r.dll missing error is a common issue that prevents Call of Duty: Black Ops III from launching. This error usually occurs because your antivirus software mistakenly flags and deletes the file, or because your game installation files are corrupted.
Method 1: Check and Restore from Antivirus Quarantine (Most Common)