The tutorial movies require the EnSharpen codec, which you can download here.

Part 7A Roads	QuickTime Movie 6:49	HTML Tutorial	.
Part 7B Barrier Fence	QuickTime Movie 2:26	HTML Tutorial	Project at the beginning of this section: VNS 3 DVD: WCS\WCSProjects\Tutorials\YNP\Cabin7B.proj
Part 7C Building Pad	QuickTime Movie 1:45	HTML Tutorial	Project at the beginning of this section: VNS 3 DVD: WCS\WCSProjects\Tutorials\YNP\Cabin7C.proj
Part 7D Overlapping Terraffectors	QuickTime Movie 5:49	HTML Tutorial	Project at the beginning of this section: VNS 3 DVD: WCS\WCSProjects\Tutorials\YNP\Cabin7D.proj
Part 7E Cabins	QuickTime Movie 3:07	HTML Tutorial	Project at the beginning of this section: VNS 3 DVD: WCS\WCSProjects\Tutorials\YNP\Cabin7E.proj