How to build 64-bit Standalone Player?

Im interested on how to build 64-bit Standalone Player in Unity 4.5.2. Every link that ive found on the question is about Unity 3.5 and the way to do that doesn’t work for me in 4.5.2. Ive tried to go to Build Settings->Target Platform->Windows x64, but Windowsx64 is not their for me. Any Ideas?

Target platform is still Windows, but set Architecture to x86_64.