For some reason the Winders bootloader is in odd path on my computer and GRUB was not automatically detected.

/EFI/Microsoft/Boot/bootmgfw-win10.efi

Rather then location it’s detecting in os-probe …

/EFI/Microsoft/Boot/bootmgfw.efi 

Which when run just drops me hopelessly back to the grub the prompt, waiting for me to type exit and find the proper file by navigating the EFI menu.

But with a bit of custom GRUB-ing around the system, I was able to get the Winders so I can pick out from the boot menu and easily start it up without mucking around in EFI each time I need the Winders. Which I know absolutely nothing about, and I’m scared to death to play with GRUB because I know that it can break things and make my computer unable to boot, but so far it seems like dual booting is working.

But alas it works. I wish I wasn’t so bad for computers, having not a clue to how use this fancy technology.