After setup process the game will be available to launch on your own account, just as any other game or app you purchased directly in Xbox Store.
The Long Dark is a thoughtful, exploration-survival experience that challenges solo players to think for themselves as they explore an expansive frozen wilderness. Monitor your Condition, search for life-saving supplies, and master survival skills like fire-building, maintaining your gear, hunting, fishing, and landmark-based navigation. There are no zombies -- only you, the cold, and everything Mother Nature can throw at you.
This is an Xbox Play Anywhere title, you will be able to play it on both Xbox One and Windows 10 PC at no additional cost.