It's actually a bit of both - You can browse pretty well all the same content on the Microsoft Store, however there is an Xbox app for Windows that operates sim

It's actually a bit of both - You can browse pretty well all the same content on the Microsoft Store, however there is an Xbox app for Windows that operates similarly to the store, and only offers games (as well as access to GamePass, which is also available for Windows as well as Xbox). IMO though it's a shame we still need the separate "Xbox Accessories" app to update controllers and change their functionality when there's a dedicated Xbox app, that and the strange interoperability between it and the EA Desktop program for EA Play titles. Otherwise, I have to say the it's really well-built and serves its purpose pretty well to the point I find myself going to it more often than Steam for games I own (or subscribe to).