As a little aside on the MT5 format. The reason we started reffering to things like;

actor box_1

and

actor Mag  3

Rather than;

prop box_1

and

magnetDeformerProp Mag  3

Is that, in P4,  using "actor" allowed poses to be applied to props even if the prop was not parented to a figure, but there still needed to be a figure in the document for any pose file to work, you wouldn't even get the check mark to load a pose at the bottom of the pose pallet untill a figure was loaded, nor would a Pose Dot work without a figure in the scene.

MT5 format seems to have changed all that. In P6 I can apply a pose to a prop (or light or camera) by saving it to the 'materials' folder and giving it an MT5 file extension. This works even if no figure exists in the document, and you can address the prop either by "actor $CURRENT", or by its own name, eg "prop box_1".