Introducing Quick Look Doctor

If you&rsquo;ve ever pressed Spacebar in Finder and gotten the wrong Quick Look preview — plain text instead of Markdown, someone else&rsquo;s renderer, or a blank stare from macOS — you already know the pain. PluginKit registrations are fiddly, conflicting extensions are common, and the fix usually involves a scavenger hunt through Terminal. Quick Look Doctor is a free macOS utility that turns…