But in the event i get the movies in a different format other then the two I mentioned, could I get a third party video player to play such files?

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Uff, that´s a very wide area, ...

There are DivX, Xvid or the Apple MPG4 decoders. Also you should get Sorenson, the Apple MPG2, Flash 7, AAC, OGG, etc. etc. (at least 20 more codecs)

Problems occure with VBR encoded audio or some .avi container files, and all h.xxx files and novadays with this HD-crap.

Quick Time 6.02 pro could be of interrest, vcd, Divxdoctor or Win.Mediaplayer 7, ...