Note: The 32-bit editions of Windows don't support UEFI features. Only 64-bit editions of Windows can take advantage of the features that 64-bit UEFI firmware enables. Fortunately, the CSM in current UEFI implementations
enables 32-bit operating systems and other operating systems that don't support UEFI to boot on hardware that has UEFI firmware. But, operating systems that require a CSM to boot can't use UEFI-specific features because the CSM emulates earlier BIOS.
Because of the widespread availability of 64-bit hardware, the capabilities that UEFI offers, and the rapid transition to UEFI firmware, Microsoft has chosen to implement all new firmware-related
Windows features on UEFI systems first. Microsoft will evaluate the possibility of additional architectural work to support new features on older BIOS systems on a case-by-case basis.
