RAR Key is a RAR-compressed file access password recovery tool. It lets you recover the access password of all versions of RAR including 3.x.
RAR Key uses two methods to get the password you´ve forgotten for the RAR file: One by Brute Force - all the combinations possible until you get the right one, and another using a dictionary of the most probable combinations (it comes integrated). It lets you configure the dictionary yourself.
Also RAR Key supports the recovery of passwords that have non-English language characters.
The main problem is that the process is quite slow when wanting to restore the access password, lasting between 1 and 30 minutes depending on the size of the password.