Sometimes, the issue is a simple lack of permission.

Right-click on and select Properties .

Fortunately, this problem can be resolved using the proven troubleshooting steps detailed below. Why This Error Happens

Antivirus programs, including Windows Defender, are designed to protect your PC from threats. However, they can sometimes mistakenly flag the steam_api.dll as suspicious or a "crack" for a pirated game and quarantine it, effectively deleting it from your system.