Make sure you have in microphones plugged into your computer.
Open up MS Sound Recorder and your mp3 player. Press record on MS SR and lpay on your mp3 player. if it's longer than 60 seconds, press record once it reaches 60 seconds because MS SR will stop, unless you press rcord again at which point it will keep adding to the file. Then save it and you have a wav file.
You could also use
this from the SEN database. The reason I mentioned the above method is because it will work with any sound format.
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There's a better way. You can get high quality, not have to dl some program, and not need a microphone. Just go to sound recorder, look for audio properties, click on volume near the micrphone picture, then finally click on "wave out mix". (May have to lower the bar on it for better quality) And da bam. If your computer is playing it, you can record it. That simple.