If the file is password-protected, the password is often found on the forum or website where you originally discovered the link.
Since .rar files from unofficial sources can contain malware, always scan the file with updated antivirus software before extracting it. Use a reputable extractor like 7-Zip or WinRAR. The Buck Breaking Chronicles.rar
Typical contents of such "chronicles" include PDF documents, scans of historical records, or commentary tracks. If the file is password-protected, the password is