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Enter or a double-click opens the selected file with Windows, and opens a folder in the list.
F3 views the selected file:
  • A text file opens read-only in the built-in editor. That includes source files, .txt, .md, .json, and names such as Makefile and README.
  • An image the program can decode, such as PNG or JPEG, opens in the image viewer.
  • Anything else is left to Windows.
F4 edits a text file in the built-in editor. It refuses a file that is not text.
Both commands need a single selected file. They do nothing in the clipboard history.