I don't think the cat file is necessary, but it's still very easy to copy it into the system32\CatRoot\{F750E6C3-38EE-11D1-85E5-00C04FC295EE} folder. And trying nothing, I've got the method worked out already (and it's successful). I'm just waiting on verification that HighMAT works and I'm releasing it. The one thing is that I'm doing it for the English version of Windows. However, other languages shouldn't be too hard to do, is it will only mean changing some files and editing an INF.