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If you didn't download it intentionally, do not open it . Archive files are common delivery methods for scripts that can write to remote processes.

Use a service like Hybrid Analysis or VirusTotal to see if the file has been flagged for suspicious behavior. If you didn't download it intentionally, do not open it

To provide a more specific story, could you clarify or what you were hoping it contained? 0000950103-15-005303.txt - SEC.gov If you didn't download it intentionally