I've seen that Napoleon TW and CItadel TW had muskets/rifles with firing smoke/fire effect. My question is how do you do this? I've tried adding an explosion effect but the game CTDed on me. I can't work out particle effect to not follow the projectile and becomes a trail effect. Is there a trick to do this?

Any help is appreciated.

PS. This is not for a mod but for personal amusement.