(U)EFI has a very open architecture. MS could well write an NTFS driver and register it with the firmware to be loaded prior to handing off to the NT boot manag

(U)EFI has a very open architecture. MS could well write an NTFS driver and register it with the firmware to be loaded prior to handing off to the NT boot manager. These sort of things tend to go against the grain of platform portability, though, even though pretty much the only platforms Windows appears to support these days are (or have been) consolidating around UEFI and ACPI.