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I installed Visual Studio 2015 and opened a VS 2013 project, after which old C# Windows Forms do not open.
Use the F5, the debug menu appears but does not open anything on the screen, the project appears running in the task manager but nothing appears on the screen.
I created a new form and put it to start for it and it works, I mean, the new forms I create open normal, the old ones no longer open.
In VS 2013 also no longer runs.