Basically, I had a project that was written with Visual Studio 2010 Express in C#, I then tried out using Visual Studio 2012 Express with that file, and now VS2010 says:
“The selected file is a solution file, but was created by a newer version of this application and cannot be opened.”
Now when I had looked up about this, Microsoft said that you can still use 2010 if you do not use anything that was VS2012 specific. Well, I had tried out the built in Testing that is in the VS2012, and that was the only thing that was VS2012 specific, but deleting that from my project (the Testing project), still left it saying that it was created by a newer version.
So, how do you make a VS2010 solution that VS2012 modified work with VS2010 again?
SP1 for VS 2010 is required to open VS 2012 modified solutions.