In Batman: Arkham Asylum for Windows Live, how do I get back to offline profile?

I recently had to move my save games around and here is what worked for me:

1. Create a new game and make sure that it autosaves (this happens as soon as the first cut scene is over)
2. Exit the game completely - this is important because if you don't it will still try to access the old game.
3. Navigate to the save folder - probably something like 'Eidos/Batman Arkham Asylum/SaveData/019243000000/' <- the last folder will be different but you get the point
4. You'll see a save0.sgd file in that folder. Replace that with your actual save file (you may have to rename your save to save0.sgd) - the file size is usually about 60kb or so.
5. Restart the game.

Hopefully this will work for you.