How do I set the cover art image for M4A files?

[Kleylux]

I'm working on a music player that can show the basic metadata of the current song and its cover art. Also, if no metadata is available, it can be downloaded from the internet and saved into the file. To achieve this I'm using the following code:

SongMetadata = TagLib.File.Create(path);
SongMetadata.Tag.Title = SongName;
TagLib.Picture CoverArt = new Picture
{
Type = PictureType.FrontCover,
Description = "Cover art",
MimeType = System.Net.Mime.MediaTypeNames.Image.Jpeg,
Data = ImageBytes
};
SongMetadata.Tag.Pictures = new IPicture[] { CoverArt };

It works pretty well for MP3 files, but today I tested it with M4A files and they corrupted. I've been searching for a solution, but I didn't get anything yet. I've been reading about M4A and I know it can't contain ID3 tags, which MP3 uses. I need help please D: