Advanced Archive Password Recovery (or ARCHPR for short) can be used to recover lost or forgotten passwords to ZIP (PKZip, WinZip), ARJ/WinARJ, RAR/WinRAR and ACE/WinACE archives. At the moment, there is no known method to extract the password from such compressed files, so the only available methods are "brute force" and dictionary attacks (for ARJ and ZIP formats, known-plaintext attack is also available).
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