Cinematics are categorized into 4 categories:
1) Introduction cinematic (.avi)
2) Victory cinematic (.avi)
3) Defeat cinematic (.avi)
4) Introduction bitmap (.bmp)
Except for the bitmap image (a template is available here
). You may use any .avi file as the introduction, defeat, or victory cinematic.
However, no cinematics works with multi-player scenarios, and only intro bitmaps work in campaigns. All will work in single player scenarios.