pz3 to fc2 conversion is probably used for export of some 3D content or animations done using Poser, but unfortunately, we were not really able to find any specifics about this or what the exact purpose of such export might be. In any case if you face some particular issue with these file types or need something specific with the export, it would be perhaps wise to reach out to the online Poser community for help.
Updated: August 7, 2023