Of course, you were all right. I have to modify the file extention to WAV file and then I can insert the audio file in my video project. It seems easy with file that I can read from a CD, using Windows media player to extract and modifying the extension to WAV. But for the files I have bought on iTUNES, it seems more complex. I have tryed using program like AUDACITY, winLAME 2017 and FFmpeg but nothing seems to work. I will try to burn my iTUNE music on a CD and then extract the file, using Windows media player , from the CD. It seems to be an indirect way but I will try it and comeback to share results.
Thanks again to all.
Serge
Serge,
Audacity will record anything playing on your computer. Start Audacity, press record, start and play your media in your favorite player and save it as a WAV. Please don't use my suggestion to violate someones copy rights!