Shortcuts · Files
Quick preview: the Mac and Windows shortcut
macOS
Space
Windows
Not built in — PowerToys Peek (Ctrl+Space)
What catches people out
Windows has no built-in Quick Look. Explorer's Alt+P toggles the persistent preview pane, which is a different thing. PowerToys Peek is Microsoft's own add-on and the closest match.
See it in the full table alongside 69 others, or search for the one you actually came for.