Program
Try to use ARPR(Advanced Rar password recovery). I have 1.2 version, but I think that this version is too old nowadays. Globally, it is the best program to recover lost passwords for RAR archives(it's my opinion ;-). It includes dictionary attack, brute force attack...(however brute force attack is disabled in shareware version - you will need to download keygen ;-). Momentally, I don't remember where I downloaded this warez, but try search phrase "ARPR download" or "Advanced rar password recovery download" in Google. Some good sites are allways online..
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P.S.: I try it and it works well(how a surprise for me
P)