Why won't After Effects import an uncompressed avi file? I just recorded a demo from cod4 with 2000FPS.

I used Vdub to make an uncompressed video from the Screenshots. 
After saving as an avi, the file looks good. (Apart from the lack while playing in windows media player which is probably caused by the large Framerate)

When I try to import to after effects or encoder, I get the error that it can't be imported.

But why?
After effects should take in the image sequence just fine. No reason to run it through Vdub first. Let me know how it works out for you, it sounds like a very interesting project.