RAR is a compression format. That type of .rar file indicates that you have been sent a package of compressed files, which you can open and decompress by installing a RAR file compressor/decompressor. To clarify, the RAR is similar to the well-known ZIP, which you have probably used before. I recommend you see the Another reference that you may find interesting is , a free program to compress and decompress that supports multiple file types, including .rar.
What is a .RAR file
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