Sometimes I have to work with .m4a files. It turns out that Vegas required Quick Time to read them. Now that Quick Time is discontinued and that it is recommended to remove it, are there alterntives ? What would you use to convert .m4a to .wav ? (no online conveters please ;-) .
I find it more stable to convert any mp3 or m4a audio files into WAV files first. This way, Vegas, and the underlying system, doesn't have to work so hard decompressing things.