removing windows movie maker

How do I remove the audio from a “video with audio” file in Windows Movie Maker?
Let’s say I want to remove the original sound from a video in windows movie maker and want to put in my own audio, but the original audio (that I want to remove) does not show up in the “Audio/music” section at the bottom.
Uncle, you didn’t answer my question. I asked HOW to unlink the audio.
frist unlink video and audio, then select audio and puch del botton.
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