Shortcuts · Files
Open the file manager: the Mac and Windows shortcut
macOS
Option+Command+Space
Windows
Win+E
What catches people out
Win+E opens Explorer from anywhere. ⌥⌘Space opens a Finder search window, which is the closest global equivalent — ⌘N only works once Finder already has focus.
See it in the full table alongside 69 others, or search for the one you actually came for.