Didn't Anthony Hernandez release a draft document of some kind, during the early Poser 5 days?  I don't remember what it was called, or what his Rosity user name was.  :unsure:  That was an "official" document, albeit not one which ever had an official release.  I suspect everything in it has since been included in other Poser file reference works.

I usually refer to Kuroyme's guide.

http://www.kuroyumes-developmentzone.com/poser/poserfilespec/products_poser_cr2.html

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.