Hiya Wolf37,
The "ahf" files are just text files which can be read by the AH film viewer (Or "notepad" for that matter). They only contain data about your flight (Terrain, A/C other players etc) they are not actual image files at all. The easiest way to do what you are trying to do is to use the stand alone AH film viewer and save the films as an "avi" You should then be able to use a normal video player, editor to do what ever you want. but beware if your film is long saving it as an "avi" will create a huge file.
TTFN
snafu