Use tools like 7-Zip or WinRAR to view the internal file list and sizes without actually running the contents.
If this is for a creative project, the file could "stalk" the user by reflecting their own data back at them in an unsettling way: Download Stalk You rar
Look for "features" that allow the file to hide itself from the task manager or automatically restart upon reboot. Use tools like 7-Zip or WinRAR to view
A persistent background process where, if you delete the app, a small text file appears on your desktop a few minutes later saying, "I'm still here." Feature Concept 2: Behavioral Analysis (Cybersecurity) if you delete the app
Check if the file requests Administrator Privileges to record screens or log keystrokes.