Let’s get this straight once it for all… regarding old boards.
Any OS win7 up with support for NVMe will use any NVMe disk as a regular storage device disk, win7 requires KBs from MS and it may need a driver, modern OS will use OOB MS driver from the OS itself (Standard NVMe controller).
The NVME boot operations on this mb’s ARE NOT related to OS or Windows drivers/controllers.
They require an NVMe disk with its own embedded OpRom (Like the SEC950 Pro) or adding it to the mb bios, this is pre-OS hw level environment loading from the firmware (aka Bios Legacy).
Officaly requirements for OS install is an x64 image and GPT partition style.