# https://rwmj.wordpress.com/2010/11/04/customizing-a-windows-7-install-iso/
$ dd if=../en_windows_10_x64_dvd.iso
    of=boot.img bs=2048 count=8 skip=734

$ mkisofs -o ../new-win.iso -b boot.img -no-emul-boot -c BOOT.CAT
    -iso-level 2 -udf
    -J -l -D -N -joliet-long -relaxed-filenames .

dd if=/home/masi/Downloads/en_windows_10_multiple_editions_version_1511_x64_dvd.iso of=/home/masi/Downloads/boot.img bs=2048 count=8 skip=734
8+0 records in
8+0 records out
16384 bytes (16 kB) copied, 0.000392973 s, 41.7 MB/s