Wikipedia articles have apparently good info but not always really-really correct/updated:
>GRUB4DOS was a now-defunct GRUB legacy fork that improves the installation experience on DOS and Microsoft Windows by putting everything besides the GRLDR config in one image file. It can be loaded by the Windows Boot Manager.[33][34]
grub4dos was never defunct, it changed quite a few sites/places of development but it is still alive and kicking and now has also a version with UEFI support:
>GRUB4DOS was a now-defunct GRUB legacy fork that improves the installation experience on DOS and Microsoft Windows by putting everything besides the GRLDR config in one image file. It can be loaded by the Windows Boot Manager.[33][34]
grub4dos was never defunct, it changed quite a few sites/places of development but it is still alive and kicking and now has also a version with UEFI support:
https://github.com/chenall/grub4dos
Unofficial western forum:
http://reboot.pro/index.php?showforum=66