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I've been rebuilding my music library repurchasing music I've had as mp3s and lower bitrates back in iTunes. However I'm not really satisfied with how iTunes handles the tags. It's not consistent which makes things look ugly when the music is used on non-apple products (i.e., my Android phone).

So now I'm going back to try and retag everything I have so far so everything is complete. Most iTunes-specific tags are pretty straight forward to understand (e.g., sort orders, purchase info, etc.) or are simple enough to figure out but I've come across one that isn't as clear.

One m4a file has an ITUNMOVI tag applied to it. The value appears to be an iTunes XML data file. In this case, contains a file size and "flavor."

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">

I'm guessing this file was derived from a movie file or other metadata that they didn't put as a custom tag?

What is the purpose of this tag? What would be a useful description for this tag?

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