If that dont work, go to your film, right click, open with, navigate to c:/hitechcreation/aces high/films and look for the film viewer icon, click on that. Ensure you click on "always use this program for this type of file" click on ok.
Whats happened is your computer doesn't know what program is associated with that file type. Once you tell it, it'll remember and you wont have this problem again.
Wurzel