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If you must see the contents without running them, use a tool like 7-Zip to "Open Archive" rather than "Extract." Check for executable extensions inside (e.g., .exe , .scr , .vbs , .js ). Sky.Puzzle.rar
The name is highly generic, often used in "alternate reality games" (ARGs) or as a bait file for social engineering. Upload the file to VirusTotal to scan it