As stated here ( Why is there no 64bit version of Visual Studio 2010? ) , Visual Studio 2010 IDE is a 32bit process.
Will the new version of visual studio 11 have a 64bit version?
As stated here ( Why is there no 64bit version of Visual Studio 2010?
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No. Visual Studio 11 will not have a 64bit version. See also: http://thenextweb.com/microsoft/2012/02/23/visual-studio-11-beta-due-february-29th/