Fail to open document

Hi!

In front of me I have a fla file that has been produced on a PC with Flash 8. I’m trying to open it with the same version of flash but on a Mac and only get this fail to open popup window.

This has worked fine before so that’s why I hope for some help since I have no clue.

Anyone having experience from similar problems?

All ideas are highly appreciated.

Regards

Christian