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No, it is not possible.
PNG doesn't support layers.
A few apps stuff their own private data into PNG to hide layer data, but well, it's private undocumented data.
So how would one go about extracting the layers from an Adobe Fireworks created layered PNG, now that fireworks is retired?
I beg to differ on that.
PNG's do support layers as I use PNG's all the time just not in Photoshop.
You can save Layered PNGs in Fireworks.
Well, according to this (and everything else) PNG does not support layers:
Fireworks used PNG as its native file format, so it's possible it "bent" the spec internally to accommodate application functions. But it couldn't export layered PNGs to the world, they wouldn't be understood.
Anyway, Fireworks is history now.
Ah, as it been retired from the Legacy CS6 apps?