Apple OS X x64/x32 installations

Does anyone know how to produce the x64 installations on MAC OS X?

I see the downloads of x64 JRE VM packs for Windows, Solaris e.t.c. - but Apple OS X Oracle packs are without any info about the platform.

My MAC's OS is OS X 10.8.5, it supports the x64 applications, but all the builds made with InstallAnywhere are x32. How can I produce the x64 installations?

Thanks in advance! I will appreciate any your assistance in this question.

Igor