If you are seeing errors related to this file, it is usually because your antivirus has quarantined or deleted it. Missing File Error
steam-apirajas.dll typically refers to a custom or cracked version of the Steam API specifically for Age of Empires II HD: The Rise of the Rajas steam-apirajas.dll age of empires 2
Are you seeing this error with the or the older 2013 HD Edition of the game? If you are seeing errors related to this