method 1:
- use CDex or dBpowerAMP Converter
- direct convert MP3 to WAV

method 2:
- use Winamp
- Option --> Preference --> Output plugins --> Nullsoft Disk Writer
- Configure --> Convert to format: PCM 44.1kHz, 16-bit stereo
- choose save location, open the MP3 file, covert process wil begin.

method 3:
- use Sound Forge or Adobe Audition.
- open MP3 file, save in PCM 44.1kHz, 16-bit stereo

it's possible.
i use Advanced WMA Workshop to convert MP3 to WMA and vice versa.

RealProducer 10

- run EO Video.
- use the Explorer, drag RM file to the Playlist to the right.
- click Convert.
- click Profile, select DivX AVI or VCD MPEG
- for DivX AVI, under Video, select DivX compression, same size as RM file
- under Audio, select MPEG Layer-3 compression or DivX Audio
- for VCD MPEG, under Video, select 352 x 240 and 29.97 fps
- click Output, select output folder.
- click Convert