[visual-studio] How do I fix an "Invalid license data. Reinstall is required." error in Visual C# 2010 Express?

I get this error only when trying to open older solution files. For instance, I've got VS2013 installed and this error message pops up when I double click on a VS2010 solution file.

Getting rid of it is so simple:

  • Launch VS2013

  • Open the old solution file by clicking
    "File->Open->Project/Solution..." from the menu (or simply by
    pressing Shift+Ctrl+O)

  • Save the solution with the new format by clicking "File->Save Solution As..." and overwrite the old file.

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How do I fix an "Invalid license data. Reinstall is required." error in Visual C# 2010 Express?