If Method 1 fails, your antivirus probably deleted the file the moment Steam downloaded it again. You need to restore it and create an exception.
Click . Steam will automatically detect and redownload the missing DLL. Check Antivirus Quarantine :
This is the most reliable method for official Steam versions, as it automatically identifies and redownloads only the missing or corrupted files. Open your . Right-click on Call of Duty: Black Ops 3 . Select Properties > Installed Files . If Method 1 fails, your antivirus probably deleted
Ensure you download the correct 64-bit version and place it directly into the Black Ops 3 installation folder (usually found in steamapps/common/Call of Duty Black Ops III ).
| Step | Action | |------|--------| | 1 | Verify game files in Steam | | 2 | Check antivirus quarantine | | 3 | Disable Controlled Folder Access temporarily | | 4 | Reinstall Steam if above fails | Steam will automatically detect and redownload the missing
A verified, interesting blog post would likely highlight:
Are you using any , mod menus, or custom clients (like T7)? Which antivirus software are you running on your PC? Right-click on Call of Duty: Black Ops 3
Steam will scan your folder. If steamapi64r.dll is missing, Steam will automatically download a fresh, verified copy.
Reinstall/repair the Steam runtime files
The verified fix is:
Navigate to the (or Local Files ) tab on the left menu.