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Shell context menu does not support a Visual Studio 2008 sln file which contains a vcproj file
Right-mouse clicking on a Visual Studio 2008 sln file which contains a vcproj file produces the following exception:
Microsoft.Build.Exceptions.InvalidProjectFileException: "The project file \"MyProject.vcproj\" is in the \".vcproj\" file format, which MSBuild no longer supports. Please convert the project by opening it in the Visual Studio IDE or
running the conversion tool, or use MSBuild 3.5 or earlier to build it."
The exception does not produce any error messages and so the shell context menu simply does not get displayed.
As part of this task, I also recommend logging any exceptions to the event viewer for example.