I stopped using SFZ and sound fonts a very long time back. With the better sounding sample using synths, there was no reason as I saw it.
Well..... (and this is a guess) the new W8 OS may not be compatible or vice versa with SFZ since it is a much older synth. There could be a workaround.... but I have not used SFZ in years.... I'm not even sure if it's on my new DAW (3 years old now) I know it's on my old Vista Dell Lappy.....