Question Windows 10 Software Creation Tool - BIOS or UEFI?

[aoresteen]

What is the DEFAULT type system that the Windows Software Creation Tool uses? BIOS? UEFI? I can not find an answer to tis.

Thanks!

 

[hotaru.hino]

If it's not giving you an option, UEFI, otherwise it can't boot when CSM is disabled.

EDIT: To clarify, EFI system partitions can be booted from a system that has CSM (both legacy BIOS and UEFI) enabled. If the partition is not an EFI system one but legacy BIOS compatible, it won't boot if CSM is disabled (UEFI boot only).