The Poser unpacker still needs a properly set up zip. If there are only image files then they don't have a set place - they are most likely textures or templates. Textures you can put wherever you like, somewhere in RuntimeTextures would be most logical, and apply them through the Surfaces palette (by clicking the bar next to or under the property you wish to apply them to with the surface you want to apply them to selected). Templates don't get used directly at all - they are used as a guide when painting new textures, so you can place them wherever you like (if you even have a use for them). For other things, without knowing what kind of file is involved it's impossible to answer.