I recently decided that I wanted to look at some of my old VS2013 projects from back in the day, so I installed Visual Studio 2013 Update 5 and attempted to open one of my old XNA projects. I was greeted with an "This project is incompatible with the current version of Visual Studio" error on the .csproj file and a "The application is not installed" error on the .contentproj file. I made sure that the relevant SDKs for .NET and XNA were installed, but I still can't seem to get the project to open.