Use mkisofs or ImgBurn with a floppy emulation boot image:
map --mem /path/to/large.iso (hd32) map --hook chainloader (hd32) grub4dos installer 1.1 64 bit
The Grub4DOS Installer 1.1 64-bit was released to address the need for a 64-bit bootloader that could take advantage of modern processors. This installer was designed to simplify the process of installing Grub4DOS on a computer, making it easier for users to configure and manage their bootloaders. Use mkisofs or ImgBurn with a floppy emulation
Version 1.1 (64-bit) specifically ensures that on 64-bit CPUs running 64-bit Windows, the installation process does not crash due to legacy WOW64 (Windows-on-Windows 64) limitations. Restart your computer
Restart your computer. If installed to MBR, you'll see the GRUB4DOS menu before Windows loads. Use the arrow keys to select an OS.
timeout 10 default 0
: It is particularly useful for maintaining older systems or creating "Swiss Army Knife" USB recovery drives that need to interface with both older and newer OS environments.