Missing Comms and ATIS audio in fs9

[downwind]

I have suddenly lost Comms and audio ATIS in fs9. This is a new one on me in 14 years of using the sim. Anyone have a suggested fix?

[MrZippy]

Are you using the computer's speakers or headphones for the Comms and ATIS audio?

[downwind]

Speakers:

Aircraft sounds are normal, but I notice that when I go to the setting to choose the pilot and atc voicesa, M or F; nothing shows.

[downwind]

I noticed that the sound file was missing from the fs9 directory, so I recovered it from a back up and all is well. I guess the question is: What happened to the original one?