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Obviously VS2008 is written in part in c# but I'm wondering to what's extend. Is c# the driving force with win32 interop or is it mostly win32 with some c# interop

+1  A: 

Similar to this question, no?

Secret Agent Man
A: 

According to Microsoft, it's written in MFC C++ (can't find the link).

Zach
+1  A: 

I believe that most of Visual Studio is a C++ COM app. I don't think it uses MFC, but I'm not positive. All of the C#/VB specific UI is written in .NET, though.

Visual Studio 2010 is getting a massive rewrite and will be a WPF application.

Andy