It seems like several popular audio converters support M4P format and can convert it to several other audio formats including WAV. The quality won't improve as MP4s feature lossy compression, however the file size might be increased dramatically.
Convert Apple iTunes Music Store audio to WAVe PCM Sound, standard Windows sound format.
We found 3 software records in the database related to .m4p to .wav file format conversion.
Microsoft Windows software - convert m4p to wav on Windows
A free music management program
Convert from m4p file format
|Yes, Helium Music Manager supports m4p file conversion as a source file type.||No||No||No||No||No||No||No|
|Yes, Helium Music Manager supports wav file conversion as a target file type.||No||No||No||No||No||No||No|
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned m4p to wav. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
A DRM remover and media converter
A digital media player and library