Can’t generate 64bit VS 2012 project files with Qt 5 binary package

With the 64bit qt 5.1 binary installer (qt-windows-commercial-5.1.0-beta1-msvc2012_opengl-x86_64-offline.exe) you will get 32bit project file. Steps to reproduce:

• Install Qt 5.1.0 beta
• open ‘Qt 5.1.0 64-bit for Desktop (MSVC 2012)’ command prompt and run the corresponding vcvarsall.bat
• go to some example directory (like, examples\widgets\mainwindows\menus) and run ‘qmake –tp vc’ there to create the project file
• open the created .vcproj file via the explorer
  -> the project file is created for Win32 and thus there will be error ‘module machine type ‘x64’ conflicts with target machine type: ‘x86’’

The same issue was there with older Qt 5 64bit VS2012 installers too. If you compile 64bit version of Qt yourself then the project file is correctly created and the ProjectConfiguration is correctly detected (Win64).