CMSF Demo PBEM problem.

[noob]

I'm trying to play a PBEM game using a mission from the CMSF demo for the first time and my opponent has sent the file for me to put in my Incoming email folder as instructed by the manual.

I would like to point out that i'm using the demo 1.30 version and he is using the standard game, could this be the problem, as when i create my own PBEM game and put it in the Incoming mail folder i can see it in the saved game menu but not when it's a file he has sent from his machine.

Could anyone help me please ?