It's fairly easy to edit the PZ3 file with notepad. Be aware the obj file references may appear more than once.

Also Poser has two ways of referencing files. One way is putting in the full path like this
c:Poser5RuntimeGeometriesP5NudeMan.obj

The other way is like this.
Geometries:P5NudeMan.obj

Note in the second example most of the path is left off, and the separators are colons instead of backslashes. Poser assumes everything is below the Runtime directory.