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Is there any error message when you open your file ?
Please describe your OS and hardware you are using, as well as what are the changes you made before saving and quit
Which version of Flash do you have? You can check it in "About Flash" window (the number, starting with 11).
Please update the Flash and get back if you still see error opening your file .
Thank you for the response, but I found the program: Sothink SWF Decompiler. I found my codes and movies in the .fla which I placed in the old .swf file. Still thank you.
Please read the following blog post for a solution to the Unexpected File Format Error: