How do I open a csproj with ProjectTypeGuids 349c5851-65df-11da-9384-00065b846f21?

Question

I have Visual Studio 2012 Professional. When I try to open a particular csproj I get an error message

The project type is not supported by this instal

Answer 1

Found Visual Studio 2012 in the old 'add remove programs', then pressed 'change'. Fixed by installing 'Microsoft Web Developer Tools'