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Have you tried the Export > Photoshop PSD function?
Within that, if you choose Settings > Custom, you can ask Fireworks to preserve the layers for Photoshop.
Photoshop will do guide lines though, so if Imageready doesn't do the trick, try creating guidelines in Fireworks, instead of slices and THEN opening it in PS.
My version of Photoshop 6 (PC) has slice ability. It's not as good as the Imageready slicing tool, but it can do the job....
Or am I horribly confused!
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