Access is usually denied due to permissions. Is your disk format file ntsf? If this is the format, it may be because you reinstalled the system or logged in with another user. Because users are different, and your MP3 file is not simply shared, but belongs to another user independently, so you have no right to modify or even play the file. If so, the method is as follows:

1. Log in to the system with the administrator account, find the MP3 song file, uncheck "Use Simple Document Sharing" in Tools-Folder Options-View in the window, and confirm.

2. Check the properties of MP3 songs-"Security-"Add-"Advanced-"Find immediately-"Find the user you usually log in, confirm, set the permissions to full control, and confirm. You can also delete other users like s- 1- 15. This is a user of your previous system, which makes no sense.

3. Re-Tools-> Folder option is selected to confirm the cancellation of simple file sharing. Are you trying to play and modify the corresponding MP3 file with the user who usually logs in? If there are other files, modify them in a similar way. If you log in to the administrator account at ordinary times, it will be easier, and you can modify it directly without switching users. I hope it works for you!