title: Upgrade Visual Studio 2013 solutions to Visual Studio 2015
body: <p>I have installed both Visual Studio 2013 and Visual Studio 2015. Projects and solutions that were created in VS2013 are opened by VS2013 as I would expect, but I would like to be able to upgrade those files so that they would be opened by VS2015 when double clicked.</p>
  
  <p>How can I upgrade solution files that are in VS2013 format so that the Microsoft Visual Studio Version Selector will open them in VS2015?</p>