extractor application?

@asliah (11137)
Philippines
January 2, 2011 9:30am CST
i download a file but its extension file name is RAR, and i cant open this file on my laptop, my OS is windows 7, every time i open this file, it always looking for an application to be used to open the file. any one could give an advise on how could i open this RAR file?
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