[WiX-users] 64-bit burn?

Hi Everyone, I need to call a unmanaged 64-bit .DLL method from my managed bootstrapper using P/Invoke. As such I am trying to get Wix to compile my setup.exe as a 64-bit executable. I tried editing the .wixproj file changing x86 to x64. This gets Visual Studio to allow me to select the setup

[WiX-users] Trouble with ManagedBootStrapperApplication

anyone have any ideas? I love the burn concept and want to use it on my project at work but this error is making me want to pull my hair out. Is there any way to step through what burn is trying to when running my installer? Knowing my luck this has got to be something trivial... Best Regards, Phil