Age of Empires II: The Forgotten is an expansion for the HD edition, but players are advised to use the up-to-date Age of Empires II: Definitive Edition available on Steam and the Microsoft Store. For multi-part RAR files, all parts must be in one folder, and extracting "Part 1" using software like WinRAR or 7-Zip will automatically reconstruct the full file. For more information, visit the official Age of Empires website.