No. Rar files use AES encrcyption, with a 128 bit key, so if you don't have teh password, you have no realistic chance of recovering that data. AES is a strong encryption algorithm, it is estimated that it would take modern computers 65 trillion years to try all possible keys.
http://www.itsecurity.com/features/security-article-crypto-091306/[
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Forget it. You have little of no chance of accessing the rar file.