Game upgrade, issues in this area.

Hello everyone! I first played Heroes IV back in 2002, using a terribly glitchy pirated version on a slow computer. That's why it didn't click for me—I just dropped it. Since last year, I've been playing the third part, and recently, the now-favorite fourth one. I have all the add-ons, but I didn't like the title music and image of Winds of War, so I managed to change them back to the originals. However, I couldn't do the same for the intro—if I just replace the files, clicking "view Winds of War intro" shows the original movie, which isn't ideal :) Please tell me how to make it so that the original Heroes 4 intro plays on startup without simply swapping files, thank you.

If I just rename the files, then clicking "view Winds of War intro" should show the WoW movie, but instead it shows the original—and that's what isn't ideal.