Why PI Expert/Designer doesn't have Forward TOPXXX support?

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Hi all, I'm curious a little bit, why there were 2 examples of forward implementation for TOP24x back in PI Software and starting from version 6.x (I think so) you have stopped support for forward in the software. Why? Are there any problems with forward and PI circuits? I;m asking as I'd like to build 120W forward ATX supply and I'm not so sure nowadays if should go with PI or choose something else? Many thanks, Marcin
The same question from my side as well...