[Peggy S-W]

I have edited and saved this project numerous times (DVD created from video clips and photos) and now when I attempt to open it I receive a message telling me that the file is not a valid MyDvd format. The file extention is remains .dvd and the icon appearance has not changed. This happened once before and seemed to correct itself on a second attempt but this time it will not budge.
Does anyone know how to get this project to open for additional editing? I have a lot on time invested in it and I don't want to start from scratch.