Since "BH.rar" suggests an archive, below is a text detailing the history, mechanics, and utilities related to these compression formats. The RAR Archive Format
This tool provides a modern interface for managing legacy formats like BH and remains a popular choice for power users on Windows. Management and Extraction BH.rar
Modern RAR versions use AES-256 encryption to secure file contents with passwords. The BH (BlakHole) Format Since "BH
An open-source alternative that can extract RAR files and view their contents through a command-line interface or GUI. Since "BH.rar" suggests an archive
A free utility that supports a vast array of formats, including BH, RAR, 7-ZIP, and many others.