ASF File Extension

Advanced Systems Format
File extension: .asf
MIME type: video/x-ms-asf
Type code: 'ASF_'
Uniform Type Identifier: com.microsoft.advanced-​systems-format
Magic: 30 26 b2 75
Developed by: Microsoft
Type of format: Container format
Container for: WMA, WMV, MPEG4 etc.

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

Convert ASF to WAV with Mini-stream Ripper