This issue is getting me very upset very quickly. 

I was creating a video of my family through Windows Movie Maker. Midway through I saved it and decided to work on it later. When I came back to reopen I got an error message saying that it could not open my file because it was not compatible with Windows Movie Maker or that the file was corrupted. I have not deleted any of the videos I used. Everything stayed as is. I uploaded the file to One Drive to the Microsoft support team and got the vague message, "

e have responded to your support request. Go to the Microsoft Support site to view our response and follow up on your request.https://support.microsoft.com/oas/default.aspx?tp=il&tenant=WOL&sd=winlive&incno=1252759926
Thank you,The Microsoft Support Team
Note: This e-mail message was sent from a notification-only address that cannot accept incoming e-mail. Please do not reply to this message.
Microsoft respects your privacy. To learn more, read our online Privacy Statement. http://privacy.microsoft.com/"

The link doesn't take me anywhere and going through the previous messages on that page doesn't tell me anything. I'm using the most up to date windows movie maker. I believe it's windows movie maker 7. I have use Windows 8 and I have gotten no resolution. It's upsetting.