I’m trying to open a older solution, which I know I’ve opened and converted to VS 2010 Premium once before.
Now when I try to open it, I get the above notice in a dialog – and basically a message to tell me to check for more information in the status dialog.
Well, no joy. No matter what I’d do – it’d not open. I did open the C#.Net csproj project file looking for something that might lead me to understanding why the solution (sln) file was perhaps broken/referencing invalid data, or what.
Finally – the csproj file for the project, edit that in NotePad++ or your favorite text editor – look for the tag <ProjectTypeGuids> – and you will see 1 to several GUID’s there – delete them so that you end up with the opening and closing tags back/to/back.
That worked for me – HTH’s….
FYI – It took me a while but I sorted this out on social.msdn – so don’t give me the credit – but hopefully this title/tag lead you to the solution more quickly.