It is an easy-to-use tool to convert wmv to wav file. WMV To Wav Converter can convert WMV file to a wav file. With the build-in
multimedia player, you can preview the wmv file, set start time and end time, convert any audio section of the wmv file without quality loss. WMV To Wav Converter is able to encode wave file with high quality and fast speed.
It can also convert other music or movie formats such as AVI to WAV, VCD to WAV, MPG to WAV, ASF to WAV, DAT to WAV,
mp3 to wav,
wma to wav,
mpa to WAV,
mp2 to WAV, AU to WAV, AIF to WAV, SND to WAV, etc.
Requirements:
DirectX 9.0 or later
Limitations:
Outputs less than 1 minute of the wave file
Nag screen
MP4 Converter
421 KB 
$ 25