It took a while, but the remastered version of the original Halo has finally reached PCs. Halo: Combat Evolved Anniversary is now available as part of the Master Chief Collection through Steam, the Microsoft Store and the Xbox Game Pass PC beta.
https://www.engadget.com/2020/03/03/halo-combat-evolved-mcc-for-pc/
https://www.engadget.com/2020/03/03/halo-combat-evolved-mcc-for-pc/