Although .mov files are just videos and non-executable, MediaWiki still consider them as malicious. See https://commonsarchive.wmflabs.org/wiki/File:Combined_cycle_animation.mov for example.
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Not much of an issue, but it would be better if the misleading warning would be removed.
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Just to be clear, you mean the warning that says "This file type may contain malicious code. By executing it, your system may be compromised." (mediawarning)?