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If you suspect your antivirus software is the culprit, check its "Quarantine" or "Virus Chest" section. Many modern security suites (like Windows Defender, Avast, Kaspersky) have an interface showing all files they have blocked. Look for steam_api.dll , steam_api64.dll , or files related to the game you are trying to play. If found, you can the file and add an exception for the game's folder to prevent it from happening again.
Sometimes DLL errors are caused by missing system libraries. Ensure your Visual C++ Redistributable packages are up to date. Review Summary Primary Game Age of Empires II HD: Rise of the Rajas Valve Corporation (Original API) / Game Modders Reliability download+steamapirajasdll+link
If you're experiencing issues with "steam_api.dll" or similar files, here are some steps you can take: If you suspect your antivirus software is the