Halo Wars: Definitive Edition which was included and available only to Halo Wars 2 Ultimate Edition owners since the initial release, is coming to Xbox One and Windows 10 PC as a standalone download in the Xbox Store, Windows Store on April 20.
Halo Wars: Definitive Edition is an enhanced version of the original Halo Wars that runs natively on Xbox One and Windows, featuring improved graphics, additional Achievements and includes all of the DLC created for the classic real-time strategy game.
Halo Wars: Definitive Edition supports Xbox Play Anywhere giving you the freedom to purchase the game once either on Xbox or Windows, and play the game anywhere, anytime at no additional cost while all of the game progress, saved games, achievements follows you.