Use tools like 7-Zip or WinRAR to view the internal file list and sizes without actually running the contents.
If you are investigating the file's behavior for security reasons, you would look for features commonly found in or Trojans :
A UI feature that mimics a hacker's terminal, displaying "live" (simulated) stats like your current IP, local weather, or most recently opened app to create a sense of being watched.
The program scans the user's "Downloads" or "Pictures" folder and generates a personalized "dossier" based on their real file names and dates.