how to convert (RMVP to wmv)

Could anyone tell me how to convert RMVP to wmv....? (or any format could be read at Pockeet PC) I want to watch movie at Pocket PC! TVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。+ e8 q# g8 f& G+ l( d& P) L" Q
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I am very appreciated if someone could be help this issue