According to what I see, even existing .AVIs that come with my Carrara don't play in my Media player(I have Vista HB 64bit). It says the codec isn't supported or something. 

I would suspect that this should be an easy codec fix by C6, or Vista hotfixes and service packs. There are a couple of newer Vista updates that mention AVI stuff, if you want to run your OS update(my Vista comp is not an online one, its a dedicated system and Im waiting for service pack). 

I don't have Poser, Im still new at this, but others may be able to answer export question.