WMV File Extension

Windows Media Video
File extension: .wmv
MIME type: video/x-ms-wmv
Uniform Type Identifier: com.microsoft.windows-​media-wmv
Developed by: Microsoft
Type of format: video file format

WAV File Extension

Waveform
File extension: .wav
MIME type: audio/wav
audio/wave
audio/x-wav
Type code: WAVE
Uniform Type Identifier: com.microsoft.waveform-​audio
Developed by: Microsoft & IBM
Type of format: audio file
Extended from: RIFF

Extract audio from WMV to WAV with Mini-stream Ripper