To remove the WeChat music audio file format, you can do this:

1. Open WeChat, enter the chat window, find the message containing the music audio file, and click to enter.

2. In the chat window, long press the message, select the "Multiple Select" button in the pop-up options, and check this message together with other messages.

3. In the multi-selected messages, select the "Favorite" button to save all messages into a favorites.

4. Enter the "Me" interface of WeChat and click the "Favorite" button to enter the favorites.

5. In the favorites, find all the messages you just collected, long press the message, and select the "Delete" button in the pop-up options.

6. In the pop-up confirmation dialog box, click the "OK" button to delete the message and audio file.