I have never experienced this issue with m4a files unless the song is paused, therefore locked by winamp. With that being said, it goes the same for mp3 and flac files that are currently being played or paused on the song. I can't update them via mp3tag.
(┛◉Д◉)┛彡ʎɯouoıpɐɹ
Current status of Winamp: (Winamp 5.8) is not an ongoing project  get wacup
5.8 beta issue quick fix - Install 5.666 (there's no further 5.8 releases)
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