To save a game not already saved just choose the Save as item on the Project menu. You will now be able to specify a name for your game. To recognize your Fields of Battle files from other files you can give them the following names and extensions:
<f:1>Battle01.fob
<f:1>Battle02.fob
<f:1>Battle...
If you are playing the free version of Fields of Battle you can not <l:ha_save> or <l:ha_open> a game.