This is a discussion on Unlock RAR ? within the Entertainment board part of the General category; How can I unlock password protected .rar .zip archive ? I have tried program that tries all kind of password ...
depends whats in it lol.. bruteforce if its worth the time
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If it is a file from a popular site you could try a dictionary attack. There exists a file with almost every warez site + passwords. Otherwise you can try bruteforce and there the speed depends from your CPU.
If you google the "filename.rar password?", you might be able to locate the password. However, if you forgot your password to a file that you compressed, you're better off using a brute force to unrar it.