ORIGINAL: PDiFolco
I don't imagine how it can notice if I've made a fresh install *and* copied again the pbem file I've received... unless you tinker with the registry database, but first this is unrecommended and second it's not very hard to edit it.
You don't need a trace on the computer that the game was previously installed, as you can store information in the save game you want to reopen.
For example a time stamp: If your game was installed later than the date of your first turn in the match, you reinstalled the game.
Or a savegame knows when it was opened in the past, and if your (encrypted) pbem log does not contain the right trace of having done that opening operation, you did open it with another installation of the game. I guess this is how it works, right?
