AVIPreview is a very simple program that is able to play partially downloaded
AVI, MPG, divX, MPEG and VCD video files without interrupting the file, even if
it’s still downloading.
How Do
I Use AVIPreview?
The best
way to use it is to wait until the video file your downloading has at least 5 MB
of the file completed. Then, just open the .dat file with AVIPreview and see
which parts you’ve downloaded so far.