I know this is sort of off topic but how do you get to and open the film viewer? 
C:\Hitech Creations\Aces High\ahfilmor the folder:
C:\Hitech Creations\Aces High\filmsand click on one of the films you've saved and it should automatically open AHFV.
To record films in-game press ALT+R to begin recording and ALT+R again to end the recording. A dialog box will appear allowing you to name and confirm, or to cancel saving the film. You can also auto record your sorties by going to:
Options > Preferences > Flightin the Clipboard in-game.