Changing conds files

Hi, Just downloaded the F16-hav-v2. A very impressive rendition of the F16. Full marks to all concerned. The condensation effects are about the most realistic I've seen in msfs.Could anyone tell me how to replace the condensation effects in the posky 747s with these affects. Posky are up there with the best with their 747s, but the condensation effects leave a lot to be desired. I've heard people on the forum say it is easy to do this, well, I've tried, but have to admit I'm as dumb as a b----y ox at this sort of thing. Just hoping that my 5th post on various subjects will get at least one reply.Thanks,Russell.