For many years (I think at least from 2007 to 2015, maybe longer) Robert Templeton (Kuroyume) had a CG website called Kuroyume's Development Zone. Thare was a section called "The Unofficial Poser CR2 File Spec". At some point that section was converted to a downloadable PDF document - the copy I have appears to be from 2014.

However, some time between 2015 and 2018 the website vanished for good, and I've been unable to find the document anywhere else online.

The Wayback Machine may have snapshots of the site, but I can't remember the exact URL. I tried a few obvious ones but they didn't work.

I'm happy to send you a copy - I'm fairly certain there are no copyright restrictions. Just send me a PM

---

The 3Dcheapskate* occasionally posts sensible stuff. Usually by accident.
And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU.

*also available in ShareCG, DAZ, and HiveWire3D flavours (the DeviantArt and CGBytes flavour have been discontinued).