You can't create motion files unless you buy the animation ready meshes from Cornucopia. The meshes are editable inside Vue8's skeleton editor, a bit like Poser. You can apply the motion files (or create them) only to these objects. If you want to import an animated object from another app, you need to use the collada export format from said app, and import the collada file in Vue.
I don't know about VRML, sorry.