ArmageddonAviation

Hello, I was trying to update a file for a wiki I am working on, but when I tried to open up the file (which was a .PDN) it didn't open it, but instead gave me this error message: Application version: paint.net 4.1.6 System.FormatException: file is not a valid paint.net document at PaintDotNet.Document.FromStream(Stream stream) in D:\src\pdn\src\Data\Document.cs:line 1333 at PaintDotNet.FileType.Load(Stream input) in D:\src\pdn\src\Data\FileType.cs:line 496 at PaintDotNet.Functional.Func.Eval[T1,TRet](Func`2 f, T1 arg1) in D:\src\pdn\src\Base\Functional\Func.cs:line 158 Paint.net has not been updated since I last used the file, so is this a known problem or what? Thanks, Armageddon