Nice tutorial Shark.
I assume that is for when you have the windows files and you want to make a bootable .iso.
Ultraiso is saving the bootimage file etfsboot.com , with a .bif extension.
If you don't have a paid version of PowerIso, Ultraiso, etc - pretty much any burning suite you have will make a bootable iso for you.
It will ask for the windows files - you know where they are - so browse to those, and it will also ask for the bootimage file .
It is called etfsboot.com and is inside the windows files in the boot folder here :
Very few app. can utilise etfsboot.com - so extract the boot image as per the tutorial, using the free versions of PowerIso, UltraIso, or MagicIso - and use that .bif or .img you extracted when asked.
Just browse to it when asked by your burning app.