Split from this thread.

What is "codec"? I have the same problem and I have to send the file plus upload it to a flash drive for a presentation....and the mute cannot be removed. The music file is there but the mute is on and cannot be turned off in Moviemaker. I have Windows 10. I downloaded the app from Microsoft. I am going crazy. I am not technically versant. I have made another movie that is fine.

Vanessa