When is an MP3 not an MP3? When it’s a PDF. This isn’t the Mad Hatter in Alice in Wonderland, but a sort of question posed by Apple’s Music app in macOS. One reader and some other people in forums have encountered a seemingly rare issue in which the file types used for music and music video files become corrupted in the Music app’s library database. Instead of appearing as MP3, AAC, or other formats, they appear as PDF or
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