I have some files in my computer which does not play in any of my music software. First I tried to open it by using Windows Media player but a error pop up for codec something. In the same way Winamp is also not working here. I searched on the net and found that it needs some RMVB Codec to play the files. What is it. What is a RMVB file. Where can I download this codec file and from where can I get a appropriate solution to play this file. Does this need any additional software also. Thanks.