I was curious and poking around my Windows 8 system. Per Wikipedia's entry on UEFI
Boot loaders can also be automatically detected by the UEFI firmware, to enable booting from removable devices. Auto-detection relies on a standardized file path to the operating system loader, depending on the actual architecture to boot. Format of the file path is defined as EFI_SYSTEM_PARTITION/BOOT/BOOTMACHINE_TYPE_SHORT_NAME.EFI, e.g. /efi/BOOT/BOOTX64.EFI
I decided to mount my EFI system partition and check it out.
The only remotely relevant file I see is M:\boot\boot.sdi
In M:\boot there is also an en-us (which contains bootsect.exe.mui), fonts, resources folder as well as bcd, etfsboot.exe, and memtest.exe
Since there is no BOOT*.efi how does UEFI know where to find the boot files? Also the "boot" folder is lower cased and per Wiki it seems it should be "BOOT"