There a quite a few free options for video conversion these days thanks to the work of open source teams. I have found SUPER video converter and Mediacoder to be of the utmost quality. I would recommend SUPER specifically for Windows Media files. You should find that it converts quickly and easily.
To convert ant file to wmv9 we should use the different software available in the market today.like avi to wmv9 convert , FLV to WMV9 , like this we can use other different software to convert this files to the WMV9 so thus u can convert any file to the WMV9 formate .
Usually I use a software named Total Video Converter to convert videos and musics. According to wikipedia, wmv9 is a version of Window Media Video (WMV) format. To convert a video, choose output format and adjust video quality.