If the official verification fails, you can manually place the file:
Many antivirus programs, including Windows Defender, may quarantine the file as a "false positive," especially if the game was not installed through the official Steam client. Steam Api.dll Sonic Adventure 2 -UPD-
Right-click the game in Steam > Manage > Browse local files . If the official verification fails, you can manually
If the file is there, restore it and add an for the Sonic Adventure 2 installation folder. If the official verification fails
Here are some steps to resolve the "Steam api.dll" issue for Sonic Adventure 2: