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Bug
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Resolution: Fixed
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Normal
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None
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None
You can upload any file type to the cover art archive, but it will change the extension to .jpg
e.g. On http://test.musicbrainz.org/release/d9207330-8a89-302a-9d7b-05b85015b896/cover-art the first three images are really .gif, .png and .txt.