Watching Incompletes and Repairing video Files.

First Option - AVIPreview.

You can use the program to view incomplete avi files while they are downloading. This can be valuable in verifying a files authenticity.

Get AVIPreview here

Your Second choice is to Download and run Divfix

On Divfix, load file, and choose Rebuild Index, when it is done, file should be repaired.

This works to watch incomplete avi files, and to repair corrupt ones.

But remember to alter a copy (not the original) if it is an incomplete and you plan on resuming download at a later time

Get Divfix here