Okay, I've done it. I've reinstall my game from v1.03 and patched it to v1.17a directly : perhaps it can be good after so many years to have a "new" game !
Now it seems to work normaly. So thousand of thank you to you all !
But I've understood where the error message came from : I'd changed the musics of the game (cf. here : http://www.ageod-forum.com/showthread.php?5163-Custom-Music-in-AACW-A-How-to-Guide
) with personnal musics (some from Ken Burns "Civil war" as Ashokan Farewell !). And when I exchange the "sounds" file of the game with my personnal one, the error message come !... Perhaps some other players will suffer this in the future ?...
So for instance I'll play with the "normal" "sounds" file, but is anyone able to tell me what I must change to make it accept my personnal "sounds" file ? (If I remember well it allready happened when I patched to v1.16 but I don't remember...)
L'Intelligence Artificielle n'est rien à côté de la Connerie Naturelle...