I was under the impression you could just switch the file extension from "MP4" to "MP3". You should be able to do that with VLC. For multiple files you can write (read: copy, paste, edit, save) a batch file to do multiples for you. I know this is listed as solved, but I also wanted to recommend the Free Studio suite.

Here are the 10 best free Batch Video Converter software for Windows 11/10 to batch convert video files & support multiple file formats. MP2, MP3, OGG, 3GP. 3G2, AVI, FLV, MKV, MP4, MOV, etc

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Part 4. How to Convert MP3 to MP4 with Windows Media Player ; Part 1. How to Convert MP3 to MP4 Batch with Best MP3 to MP4 Converter. There is no dearth of conversion tools, but selecting the right one is very important to ensure quality conversion at fast speed and additional features.
Select Environment Variables from the Advanced menu. Click “Edit” after selecting “Path.”. Select New and type the following path: C:\ffmpeg\bin\. That is all there is to it. With FFmpeg, you may utilize Command Prompt to convert media files.
First of all, choose or make drag and drop of mp4 format video file that you want to convert into mp3 audio format. Step 2: Now, press “Convert”. Step 3: Finally, your converted mp3 audio track is ready to download. Just press “Download” and save mp4 as mp3 online.
1. Text Guide of Windows Media Player. Follow the below steps to convert mp4 to mp3 Windows media player: Step 01 To begin, open the MP4 file with Windows Media Player. The program will play it by default. Step 02 Now, hit Menu at the top-right corner to go to the Home screen. Then, select Organize > Options.
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converter mp4 to mp3 windows 10