Use the Official WinRAR utility or a free open-source alternative like 7-Zip or PeaZip .

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The file is a compressed archive typically associated with software or driver packages. While specific details on this exact file name are sparse, ".rar" files are widely used to combine multiple files into a single, smaller package for easier downloading. How to Open "8318sr.rar"

Since RAR is a proprietary format, you cannot open it natively in most operating systems without third-party tools.