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  • Booting from fedora, what's the folder tree found under /boot/efi/? Are you able to see something like /boot/efi/EFI/Microsoft/Boot/bootmgfw.efi? Or can you see ./EFI/Windows/Boot/EFI/bootmgfw.efi if you mount hd4 somewhere? Commented Mar 16, 2016 at 17:36
  • @Roflo: No, nothing like that at all. Windows is installed on another disk. Mixing boot loaders has lead to so much trouble that I do not bother any more. All I want is to let grub2 decide it should pass the torch to something else which worked fine in non-EFI mode. Commented Mar 17, 2016 at 8:27
  • Ok. What I wanted to ask is: Have you checked that your path to bootmgfw.efi is correct within hd4? Commented Mar 17, 2016 at 15:24
  • FWIW, last time I has to struggle with this (win8) all I had to do is set root=(hd0,2) and chainloader /EFI/Microsoft/Boot/bootmgfw.efi (exact options will differ for your case, of course). Commented Mar 17, 2016 at 15:26
  • @Roflo: Yes, by mounting the drive in linux and checking. However, grub2 seems to think this is an unsupport file system when I do pass it the path. It cannot load ntfs.mod from anywhere. Commented Mar 17, 2016 at 15:29