How to watch RMVB/RM movies

How to watch RMVB/RM movies? How to play real player files?

With "K-Lite Mega Codec Pack" (recommended)
1- Go to this page:
http://www.free-codecs.com/k_lite_Mega_codec_pack_download.htm
and download the latest version of the K-Lite Mega Codec Pack.
2- Install the program as default or make sure that (Real alternative) is selected.

With "Real Player"
1- Go to this page:
http://forms.real.com/real/realone/intl/focus.html
2- Just install it.