I had to figure this out yesterday when I tried to boot Acronis True Image from a bootable USB drive. True Image boots into Linux. I finally got it to boot but the screen is all garbled (separate problem).
Following on from this - anyone know if the WinPE images offered by recovery software companies will still work, (eg. Paragon, Macrium) ?
I suspect possibly not and this is why Microsoft revoked the WinPE distribution licenses.
Yet another reason to carry around a LiveCD, (Linux/WinPE on Flash or optical), when looking at buying a computer, "I'll buy it if I can boot it."