Finally, an end to having loads of different audio formats (with some only playable with set programs), if you want to unite them all into MP3 files then you need All Audio To Mp3 Converter 3.8, letting you also extract audio from video in MP3.
It converts the following types of formats, both audio and video, to MP3: WMA, WAV, AVI, DivX, xVid, MPEG (MPEG4, MPEG2, MPEG1), VCD, SVCD, DVD, Real Media (RM, RMVB, RA), Quicktime (MOV, QT), DAT, VOB, ASF, etc.