If you have found a file with this name on your actual computer:
: The "Lunar" entity (often depicted as a distorted celestial figure or a shadow) eventually "breaks out" of the windowed mode, causing the real-life computer to crash or the player to experience paranormal events in their room. Key Themes & Tropes lunar (2).exe
: The file interacts with the user's actual desktop or files. If you have found a file with this