You can try this tool -- Audio Splitter Convertor 1.8
You can download it from:
http://www.qwerks.com/download/7472/AudioTool.exe
or
http://www.coolextractor.com/download/audiotool.exe
1.It can split one Audio File (Mp3 ,Wav ,WMA ,Ogg) into smaller Audio
files(MP3,Wav ,WMA,Ogg).
2.It can can convert to all supported formats and you can switch
between formats in one click!
3.It can convert Mp3 ,Wav ,WMA ,Ogg from one format to another
4.Allow for changing the property of the MP3 Wav, Ogg, Wma(such as
Sample Rate,Bit Rate).