Ok guys let's figure this out: how do I find where the windows install iso stores it's bootloader code, because that's what I need to find. Afaict they basically nuked the hell out of iso9660 for windows 10 bootable CDs, but the bootloader is there somewhere.
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I think the way 7-zip handles it is that if the El Torito boot images are *not* referenced from the ISO9660 filesystem they wind up in a '[BOOT]' pseudo-directory, but if they *are* referenced then they show up under the respective filename.
For example, an Arch Linux ISO image has both an unreferenced BIOS mode isolinux boot entry ([BOOT]/1-Boot-NoEmul.img) and an EFI FAT image that sits at EFI/archiso/efiboot.img, as well as EFI/boot/bootx64.efi directly in the ISO fs. Windows ISOs seem to always have file entries.