I'm sure another TF2 admin has tried to view the replay files stored on his server, to investigate a cheater. But I can't figure out how to do that myself or find any instructions about it. Isn't it possible?
Have you tried this? http://didrole.com/Replay2Demo/
OMG it just works! You open the demo player in tf2 with shift-F2 an load the demo. Press shift-F2 again to regain camera control.
and stop answering your own questions, stupid.