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

Part 6A Templates	QuickTime Movie 7:30	HTML Tutorial	.
Part 6B Adding Objects to the Database	QuickTime Movie 2:27	HTML Tutorial	.
Part 6C Area Terraffector Lakebed	QuickTime Movie 4:48	HTML Tutorial	Project at the beginning of this section: VNS 3 DVD: WCS\WCSProjects\Tutorials\YNP6\YNP6C.proj
Part 6D Lake	QuickTime Movie 5:59	HTML Tutorial	Project at the beginning of this section: VNS 3 DVD: WCS\WCSProjects\Tutorials\YNP6\YNP6D.proj
Part 6E Terraffector Streambed	QuickTime Movie 6:00	HTML Tutorial	Project at the beginning of this section: VNS 3 DVD: WCS\WCSProjects\Tutorials\YNP6\YNP6E.proj
Part 6F Streams	QuickTime Movie 3:50	HTML Tutorial	Project at the beginning of this section: VNS 3 DVD: WCS\WCSProjects\Tutorials\YNP6\YNP6F.proj
Part 6G Foliage Shadows	QuickTime Movie 6:39	HTML Tutorial	Project at the beginning of this section: VNS 3 DVD: WCS\WCSProjects\Tutorials\YNP6\YNP6G.proj