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: You will need a tool like 7-Zip or WinRAR to open it.

Without more context, it is difficult to tell you exactly what is inside. However, here is how you can safely handle it:

Because .rar files are compressed archives that can contain anything from software to documents, "Useful Story" likely refers to the where you found it—perhaps a thread title or a specific category on a forum.

That specific string of numbers followed by a .rar extension looks like a or a hash often found on file-sharing sites, forums, or Usenet.

: If you found this on a forum or a private tracker, look at the comments or the "ReadMe" in the original post.

: Files with random numeric names are common in piracy or grey-market circles and can sometimes carry malware. Run the file through VirusTotal before opening it.