This error typically appears when launching the game, saying: "The program can't start because steam_api64.dll is missing from your computer."

Method 3: Run Steam as Administrator

Sometimes, Windows permissions prevent the game from reading the DLL file correctly, leading the game to believe it is missing.

For Third-party AV (Norton, McAfee, Avast):

  1. Navigate to your Black Ops 3 folder:
    • Close Steam, right-click Steam shortcut → Run as administrator.
    • Launch the game.

    : Antivirus software often flags this specific DLL as a "false positive" and removes it. Windows Security (or your third-party antivirus). Virus & threat protection Protection history Find the entry related to steam_api64.dll , and select Add the Black Ops 3 installation folder to your antivirus Exclusion list to prevent it from being deleted again. Verify Integrity of Game Files

How To Fix Steamapi64rdll Missing Error In Black Ops 3 Verified Portable Official

This error typically appears when launching the game, saying: "The program can't start because steam_api64.dll is missing from your computer."

Method 3: Run Steam as Administrator

Sometimes, Windows permissions prevent the game from reading the DLL file correctly, leading the game to believe it is missing. This error typically appears when launching the game,

For Third-party AV (Norton, McAfee, Avast): Navigate to your Black Ops 3 folder:

  1. Navigate to your Black Ops 3 folder:
    • Close Steam, right-click Steam shortcut → Run as administrator.
    • Launch the game.

    : Antivirus software often flags this specific DLL as a "false positive" and removes it. Windows Security (or your third-party antivirus). Virus & threat protection Protection history Find the entry related to steam_api64.dll , and select Add the Black Ops 3 installation folder to your antivirus Exclusion list to prevent it from being deleted again. Verify Integrity of Game Files Close Steam, right-click Steam shortcut → Run as