Need help with PBEM

[Alpha Zwo]

I have played SP a lot but my last game was more than 10 years ago. A friend of mine and me have problems to start a PBEM game.

He has set up the game and sent cmt and dat files. All I had to do was entering a password and I have send cmt and dat files back. My friend copied both files into the PBEM Games folder but cannot see the game when he start the game.

What did we wrong?

Thanks in advance.