[Mobhack]

Player 2 has moved the game from its original folder or perhaps to a different machine, which is not allowed in secure mode PBEM.

It's also possible that he has the free demo and is trying to swap different games in and out of the same PBEM slot to try to have more than 5 concurrent games going - another no-no.

NB - if it is not a competition game, just a friendly, then the BASIC security mode is probably all the security you need.

Game Guide->Playing by Email (PBEM) -> final paragraph ("Basic Secure PBEM")

Cheers
Andy