How to Fix Unrecognized Guid format in Visual Studio 2015

I fixed this on Windows 10 by using the Troubleshoot compatibility tool. It has to do with an extra checkbox being enabled.

• Navigate to devenv.exe by right clicking Visual Studio from start, click properties, and select "Open File Location...".

• Right click on devenv.exe and select "Troubleshoot Compatibility".

• Click "Troubleshoot Program"

• Uncheck "it worked with older versions of windows"

• Click "Next"

• Click "Test the program"

• Confirm everything opens correctly

• Click "Next"

• Click "Yes, save these settings for this program"

I am guessing you used to run Visual Studio as Administrator. This did it for me. The answer is to delete the compatibility entry in the registry.

1. Type Windows+R on the keyboard to open the Run dialog
2. Type regedit and press enter
3. Browse to HKEY_CURRENT_USER\Software\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Layers
4. Delete the Visual Studio entry