如何从运行VS2008 Pro的x86平台编译为x64二进制文件？

I am trying to compile my apps (which uses 3rd party libraries) for the x64 platform. However selecting x64 from Build Configuration Manager from my VS2008 Pro doesn't seem to work. The binary does get created but my client wasn't able to get it to run on x64. I am trying to compile my apps (which uses 3rd