If you were to install the PC demo of LEGO Racers, you would notice that the intro is like the N64 version - a high voltage intro that isn't pre-rendered with less detail, as well as the addition of the extra intro afterwards with Rocket Racer racing on the test track which you don't normally get on the PC.
The thing is though, with these intros not being pre-rendered, the files must exist ya? You're absolutely right! Three folders were removed from the MenuData folder in the final release, and these are:
LEGOINTR - LEGO Media intro (differs from final PC release)
HVSINTRO - High Voltage Software intro
MAININTR - Rocket Racing on the test track intro.
For your convenience of not having to download the demo and extract these files yourself, I've gone and uploaded them here:
http://oresome.rockraidersunited.com/download/398
Note: Since we can have the HVS music track separate from the sfx, I think I'll do a mashup with just the music on the video sometime later today.
Inb4 someone texture edits the voltage sign.