See if this program will work for you.
Free Switch program
I use it to convert midi files to wav, but it does other formats too.
Supported Audio File Formats – wav, mp3, wma, m4a, ogg, avi, mid, flac, mov, amr, aac, au, aif, raw,
dvf, vox, cda, gsm, dss, wmv and many more audio formats.
Audio Converter Power Features
Extract audio from DVD
Convert music from midi to wav etc.
Normalize audio levels
Batch convert thousands of files