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Use an archiver! B1 Free Archiver shall do the job.
You have to use an archiver tool to unpack the rar file. Try B1 Free Archiver.
It's an archive. Can easily be unpacked with B1 Free Archiver.
WinZip is a file archiver and compressor for Windows.
With any archive manager. File size doesn't matter, but B1 Free Archiver will do the great job.