As others have said, no pz2 (pose) file will work unless there is a figure in the scene. Even if there is a figure in the scene, either the prop must be parented to a figure, or it must be addressed as an actor. Eg for unparented props with a figure in the scene:

{
version
    {
    number 5
    }
actor $CURRENT

Or

{
version
    {
    number 3
    }
actor [nameOfProp]

Both these will work. If you are looking for something that will work in P4/P5 for multiple materials, you can do as above then save the file to a camera folder with a cm2 file extension. cm2 files will work even if no figure is in the scene. Otherwise using an mc6 is the easiest way to go, but requires P6 or later. mt5 files work in P5, but I'm not sure if they can contain multiple materials. I don't know if any of this applies to D|S.