P4 and P5, just ordered P6. I know the difference and for what it's worth, I've gone through my entire runtime changing ALL my .bum to .bmp files, then compressed them into .jpg's and use them with MAT poses for P4 because .bum files take up too much space. Unfortunately I cannot apply them manually in P4 so that's a pain because some items I have to edit (props, cr2's etc.)