A post on Steam this morning reveals that if you purchased Batman Arkham Asylum or Batman: Arkham City through anywhere other than Steam then you will have to jump through a few hoops to have the games maintain their functionality and you may have to start playing the aforementioned games from the very beginning.
The news relates to both games being moved away from Microsoft's Games for Windows Live service over to Steamworks. Microsoft announced earlier in the year that it would be shutting down the service next year and developers have been scrambling to find a suitable replacement to maintain the things it supported like achievements and online multiplayer. Steamworks seems to be the de facto choice these days.
Those who bought the game via Steam only need to download an upcoming patch and everything will be fine. Those who purchased it elsewhere will have to enter the product code in Steam that was provided with the games at purchase (for physical media that would be your CD key).
But the worst part of the transition for non-Steam buyers is the fact that all of those save games will disappear and players will have to start over.
More from the Steam update:
Dear Batman Arkham Fans - Microsoft has begun the process of closing down Windows Live services over the next year. To make sure there is no interrupted service, we will be moving the game to Steam for verification and update services for both the Base and GOTY versions of Batman Arkham Asylum and Batman Arkham City.
If you purchased either of the games on Steam all you have to do is let Steam download the latest patch and you will be fine.
If you purchased the games somewhere else you will need to enter the code in Steam. (You can find steps to do this on the bottom of this.
Unfortunately, you will not be able to continue playing from your current save. You will need to start a new game.
On a related note, some users responding to the update from Steam are saying that their CD Keys are not working. This is happening to game owners in both Europe and North America. We'll have more on this story as it develops.