Followed meep-eep suggestion to copy videos out of zip and - hurray! - it works like a charm now!
I've also (like AzureRaptor) thought that zip is the only option, so, I suppose, this info (and how to avoid Intro problem) should be posted somewhere in the FAQ.

And yes, thanx for the great work, guys!
SC is the favourite gameseries of my childhood! 

Ok, this is it.
I've installed the game for the first time and I don't know whether it's bug or not, so I'm writing here.

I have Windows 7 x64
I've just starting the game and trying to see intro.
It plays clearly for some time (~ 30 sec - 4 min as I tried it ~10 times) and then sound disappears (until the end), also the video continue to play, but freezening periodically and slower than it should be (like 3x slower).

I should also add that game after the Intro plays ok (e.g. I talked to Ur-Quan and to human colony - graphics, sound and music act as they should).

What should I do?
Thank you in advance!