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Click . Steam will automatically detect and redownload the missing file.

Since antivirus software is the #1 culprit, this should be your first step.

The Steam Overlay hooks directly into steam-api64r.dll . If the overlay conflicts with your graphics driver, the DLL may fail to load.

(Virus & threat protection > Protection history). If the file is there, select it and choose Add an Exclusion

If you are trying to restore access to your game, you can try these steps: