Getting .mp3 files out from .fla files

Hello, good day
My uncle sent me a .fla file which he made and he wants me to redo it so it’ll look better. The file has .mp3 music in it and I’m wondering is it possible for the to get that .mp3 file our from the .fla file so that I can delete the one he made so that I can make a totally new one?

Thanks
Fred