Locate in your games list. Right-click the game title and select Properties .

Click on the (or Local Files ) tab on the left menu. Click the Verify integrity of game files... button.

This is the most official and safest way to fix the problem. Steam has a built-in tool that scans your game files and automatically replaces any that are missing or corrupted, including steam_api.dll .

To prevent this from happening again, add your game folder (usually located at C:\Program Files (x86)\Steam\steamapps\common\NARUTO SHIPPUDEN Ultimate Ninja STORM 3 Full Burst ) to your antivirus . 3. Repair the Steam Library

Steam API DLLs (Dynamic Link Libraries) are essential files required by the Steam client to function properly. These files facilitate communication between the game and the Steam client, enabling features like online multiplayer, achievements, and cloud saves.

Back up your games by navigating to your Steam\steamapps\ folder and copying it to a safe location.