If your game won't launch because of this error, reinstall the game via Steam.
If the file disappears shortly after reinstalling, your antivirus probably deleted it. Open your antivirus or Protection History . Look for a file named steam-apirajas.dll . steam-apirajas.dll age of empires 2
If you find this file in your AoE2: DE installation folder, your game copy is likely unofficial (cracked) or you have installed a specific mod that hooks into Steam’s authentication layer. If your game won't launch because of this
Because this DLL is not part of the base game, the most effective fix is to remove the mod that installed it. steam-apirajas.dll age of empires 2