Although .nef files are actually images created by the Nikon D70, MediaWiki considers them as possibly malicious. See https://commonsarchive.wmflabs.org/wiki/File:20050525-033-lido.nef for example.
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Commons should not be here. And also, triaged as Low priority because this is not much of an issue, although it would be better if the misleading warning is removed.
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I do not see such a warning on that page, nor anything similar. Can you make a screenshot and point it out to me?