change format

You may try "Format Factory" which is a multifunctional media converter. The software is 100% free & supports Traditional Chinese.
Format Factory provides functions below:
All to MP4/3GP/MPG/AVI/WMV/FLV/SWF.
All to MP3/WMA/AMR/OGG/AAC/WAV.
All to JPG/BMP/PNG/TIF/ICO/GIF/TGA.
Rip DVD to video file , Rip Music CD to audio file.
MP4 files support iPod/iPhone/PSP/BlackBerry format.
Source files support RMVB.
Format Factory 1.85
http://www.formatoz.com/download.html
Hope it could be helpful!!!!
圖片參考：http://l.yimg.com/f/i/tw/ugc/rte/smiley_3.gif