Vue 2016 was capable of opening Poser pz3 files directly at one time. I would not be entirely sure it correctly open a P12 file without a few minor material issues due to Poser upgrades over the years. I no longer have access to Vue to check. There is however an alternative that may help you. Under Scripts there is one called "Collect Scene Inventory". It can dump all assets in a scene into a self contained directory you can use to collect the textures for Vue which you can apply yourself.