1. Create a new folder and move all the files whose suffix names need to be changed into it.

2. Find "File Extension" from the "View" menu, click on the small box in front to check the suffix name of the file.

3. Create a new txt text, and then enter the following characters in it. Note that there is a space in English before the *.

4. After saving, change the suffix name of this txt to bat.

5. Click and select "Yes" in the pop-up prompt box.

6. Double-click to run this bat file, and you will see that the file suffix has been changed to MP3.

Extended information

MP3 is a data compression format.

MP3 is an audio compression technology, its full name is Moving Picture Experts Group Audio Layer III (Moving Picture Experts Group Audio Layer III), referred to as MP3. It is designed to significantly reduce the amount of audio data.

MP3 takes advantage of the human ear's insensitivity to high-frequency sound signals to convert time-domain waveform signals into frequency-domain signals, and divides them into multiple frequency bands, using different compression rates for different frequency bands. Increase the compression ratio for high frequencies (or even ignore the signal) and use a small compression ratio for low-frequency signals to ensure that the signal is not distorted.

This is equivalent to discarding the high-frequency sound that is basically inaudible to the human ear, and only retaining the audible low-frequency part, thus compressing the sound with a compression ratio of 1:10 or even 1:12. Since the full name of this compression method is MPEG Audio Player3, people call it MP3 for short.