Guys, I came across the same issue, and after I renamed "C:\Program Files (x86)\Dropbox\Client\DropboxExt64.27.0.dll" away and restarted explorer, the annoying context menu is gone. If you want to completely remove the context menu items, use that. However there's no way to individually disable menu items. USE AT YOUR OWN RISK. This post is also for whomever came from Google search, as this is the first post showing on the search result.
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