The movie parts can be joined without recompression using the following method in Virtualdub (freeware)
(Please note: There are 5 parts to join as opposed to the illustrated 4 parts but the method is the same)
(Please note: There are 5 parts to join as opposed to the illustrated 4 parts but the method is the same)
Click on the image (then zoom in the next page) for a step by step guide