Attached Link: http://www.openexr.com/

> Quote - Poser seems to hand off the necessary information in an XML file, > which probably contains the same data as the PZ3, and then the > render engine gives back a file called FFrender.exr, which > seems to be binary.  Probably contains the image in some form.

The image is an OpenEXR file, it's an industry standard file format. There's a Photoshop plugin for it, and more and more programs are able to read it natively (e.g. Mac OS X ships with built-in support for it).