Ian Forsyth, program manager at ARM, could not comment on a specific release date for the 64-bit version of Windows for ARM processors, but said ARM is continuously working with software partners to add 64-bit support.

ARM did not respond to requests for comment on additional details regarding the collaboration with Microsoft on building 64-bit support for Windows. Microsoft did not respond to a request for comment. ARM's TechCon show is currently going on in Santa Clara, California.

Microsoft last week released Windows RT, an OS that is 32-bit and works with ARM processors, and also released Windows 8, which works on x86 processors and is 64-bit. ARM this week announced its first 64-bit processor designs, Cortex-A57 and Cortex-A53, which are based on ARM's Armv8 architecture. The chip designer said that it expects servers and mobile devices based on the processors to reach the market in 2014.

Windows RT is on tablets with 32-bit processors from Nvidia and Qualcomm. Microsoft's Surface and Asus' Vivo Tab RT tablet have Nvidia's quad-core Tegra 3 processor, while Dell's XPS 10 and Samsung's P8510 Ativ Tab have Qualcomm's dual-core Snapdragon S4 processor.

The 32-bit Windows RT OS has a limited memory ceiling, and a 64-bit Windows RT OS would expand the memory capacity in tablets and PCs. A 64-bit version of Windows on ARM would also bring it on par with Windows 8.