Video codes

DivX Codec - http://www.divx.com/

FFDSHOW - http://sourceforge.net/projects/ffdshow

Kazaa Lite Codec Pack - http://www.k-litecodecpack.com/

Nimo Codec Pack - http://www.divx-digest.com/software/nimo_pack.html

Quicktime Alternative - http://www.k-litecodecpack.com/

Real Player Alternative - http://www.k-litecodecpack.com/