Update: I have found an alternative method to skip the intro videos, which I have added to the wiki page as Method 2.
http://pcgamingwiki.com/wiki/Tom_Clancy%27s_Splinter_Cell:_Chaos_Theory#Essential_improvements
I'm attemping to follow the suggestion on the wiki page for Chaos Theory to remove the intro movies, along with the widescreen suggestions.
Unfortunately neither seem to be working. I've opened the correct files, commented out the lines and set my own X and Y resolution. The game is ignoring them however. The odd thing is that it isn't overwriting the files or anything, which makes me think the game ignores these files entirely for some reason. I'm running the game through Steam, if it helps..