https://www.gamespot.com/articles/halo-5-guardians-isnt-coming-to-pc-after-all/1100-6461693/

Rumors that Halo 5: Guardians is coming to PC surfaced when Amazon posted box art of the game that changed the "Xbox One Exclusive" tag to "Xbox One Console Exclusive." However, Microsoft has since reaffirmed that Halo 5 is not coming to PC.

A Microsoft spokesperson told CNET, "As we've shared previously, we do not have plans to launch Halo 5: Guardians on Windows 10 PC." Halo: Infinite is still scheduled for PC at least, but Microsoft hasn't confirmed whether Halo's sixth mainline game will be a part of the company's Xbox Play Anywhere program so it's unclear whether players will have to buy the game twice to play it on both console and PC. Halo: Infinite will be the first game from the main Halo series to release on PC since 2007's Halo 2.