I know it's a 2001-era thread, but we have a lot of new folks so I'll just reply to the issue.
- Make sure you're up to date with AH versions.
- Go through the start menu and find the AH icon group and start the film viewer manually. This re-associates the .ahf files. After that you can simply double click them in windows explorer and they should load.
If that doesn't help, we need more info on what's happening and why it's not working. That's a very vague comment. Please, though, start a fresh topic if that's the case.