Article ID : 00057729 / Last Modified : 11/04/2018

Music files with the .M4A extension cannot be played using Hi-Res Audio Player.

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If the audio file format is AAC even though it has the .M4A extension, the music file cannot be played as Hi-Res Audio Player does not support AAC file format.
A music file with the .M4A extension is supported only when the audio file format is ALAC.