Windows 11 only supports x86_64 and a boot in UEFI mode from GPT disk.They do not support IA32 UEFI boot, x86_64 UEFI boot from MBR disk, or BIOS boot from GPT disk. Windows 8/8.1 and 10 x86_64 versions support booting in x86_64 UEFI mode from GPT disk only, OR in BIOS mode from MBR disk only.On market, the only systems known to ship with IA32 (U)EFI are some old Intel Macs (pre-2010 models?) and Intel Atom System-on-Chip (Clover trail and Bay Trail) Windows Tablets, which boot ONLY in IA32 UEFI mode and ONLY from GPT disk. They do not support x86_64 UEFI boot from GPT/MBR disk, x86_64 UEFI boot from MBR disk, or BIOS boot from GPT disk. Windows 8/8.1 and 10 x86 32-bit support booting in IA32 UEFI mode from GPT disk only, OR in BIOS mode from MBR disk only.They do not support IA32 (x86 32-bit) UEFI boot from GPT/MBR disk, x86_64 UEFI boot from MBR disk, or BIOS boot from GPT disk. Windows Vista (SP1 and above, not RTM) and Windows 7 x86_64 versions support booting in x86_64 UEFI mode from GPT disk only, OR in BIOS mode from MBR disk only.It supports only BIOS boot and only from MBR disk. It does not support x86_64 UEFI or IA32 (x86 32-bit) UEFI boot.

Windows Vista RTM x86_64 (only RTM) version support booting in BIOS mode from MBR disks only, not from GPT disks.They support only BIOS boot and only from MBR disk. They do not support x86_64 UEFI or IA32 (x86 32-bit) UEFI boot.

Windows Vista or 7 x86 32-bit (RTM and all Service Packs) versions support booting in BIOS mode from MBR disks only, not from GPT disks.

Windows XP both x86 32-bit and x86_64 (also called 圆4) (RTM and all Service Packs) versions do not support booting in UEFI mode (IA32 or x86_64) from any disk ( MBR or GPT) OR in BIOS mode from GPT disk.

A good example of this is Windows 11 which still works on a BIOS/MBR configuration once the Windows Setup check is bypassed. Note: The following points only list configurations supported by the Windows Setup even though Windows itself may still work on these unsupported configurations.

Dual boot mac and windows