I have a problem with opening part 3 of Introduction to lighting basics in Maya. I downloaded the tutorial and unzipped the files. Part 1,2, and 4 will play fine but every time I try to open part 3 I get an error. This happens on all of my media players. I then downloaded the tutorial again in the hopes that it might fix the problem but it still will not allow part 3 to play.

I hope you can help me solve this problem so that I can continue the tutorial.