For ZIP files, you would instead use the "Load Unpacked" button after enabling Developer mode.
Use a tool like entr (Linux/macOS) or Watchdog (Python) to monitor a folder: when a new NaCl file appears, automatically decrypt and open it in your default text editor. This turns any editor into a near-real-time easy viewer.
Stop tolerating sluggish, insecure, or feature-poor viewers. Make the switch to NaCl Web Team Easy Viewer – and once you experience the “Better” version, you will never go back.