can you stream .m4a files from NAS to tv

I currently stream audio files of type mp3 from my DLNA compliant Western Digital NAS to a Sony media device and then to my Sony TV. My I tunes library is currently stored on the same NAS but I cant stream the audio files which are m4a. Can the Apple TV stream m4a files? Additionally I stream video from the NAS as .avi file. Can the Apple TV stream avi files? And finally would the Apple TV be compatible with my Western Digital DLNA NAS.

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