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If you received this file via an unsolicited email or downloaded it from an unverified source, it is highly likely to be malware (such as ransomware or a credential stealer). Attackers often use evocative names like "World after War" to entice clicks. World-after-War.rar
It may be a collection of assets for a tabletop RPG, a video game mod (e.g., for Hearts of Iron or Fallout ), or a digital art compilation depicting post-apocalyptic themes. Upload the file to VirusTotal to check it