Rayman

I have the .psd plugin installed, and I accidently saved my file as a .psd rather than a .pdn. Now when I try to open my file in Paint.NET I get the error: There was an error reading this file from the media If I try to open it in Photoshop it says: Could not complete your request because it is not a valid Photoshop document Please help, I desperately need to recover this file!