quite simple: Open a new game and enable replay data to be recorded.
After saving the game, open it once more continue playing for a little and save once again.
When you replay the two times saved gamestate, he replays until the first save and stops doing anything.
[edit] Sorry, it is not as easy as I thought. Just tried the above. The key seems so be to save twice without reloading. When loading the second save file, he runs until the first save and stops doing anything. He even gave me an error once:
14732.439 Error MainLoop.cpp
at the time of the first save during replay.
Greetings,
QuaB