Easter Egg

I was reading about the easter egg someone found in Civ3. There's a movie in the art/movies folder called security briefing. I found it but do not have any way to play it because it is in the .bik format. I was wondering if anyone could help me.

rename your intro.bik to intro.old, then rename the security.bic to the intro.bik file...you'll see it at game start up, prior to getting the menu