I have tried everything conceivable virtualdub(Mod) avijoiner failed. They have an Xvid codec which I am not sure might be a problem as there is some mention when I try to open them about VOB. I also have divx files identical too and they append fine. So can someone please help me as they are urgent! I need them next weekend ready. Plse take into account that I am a bit rusty at the moment with certain terms.