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What is a BH file?
A BH file is an archive that contains one or more files compressed with proprietary BlakHole (BH) compression. Users typically compress files as BH archives to save space, but they may also protect them with encryption and passwords if they contain sensitive information.
Carl Bunton developed the BH algorithm in the 1990s and made it available with ZipTV, a suite of compression components for app developers to help them securely archive and store backups. BH shares similarities with Zip compression and supports encryption.
While ZipTV is discontinued, other compression utilities, notably ConeXware PowerArchiver (Windows version only), still support the format. Additionally, non-developers may compress their files as BH archives even though it was originally intended for app developers. To create a BH archive with PowerArchiver:
- Select File → New → New Archive
- Choose the item(s) you want to compress
- Select the BlakHole option from the "Save as type" dropdown menu
- Click Save
How to open a BH file
How to convert a BH file
Various compression utilities, such as ConeXware PowerArchiver and ESTsoft ALZip, can convert BH files by extracting their contents and then compressing them in a different archive format.
For example, the Windows version of PowerArchiver can extract the contents of a BH file, then compress them as various archive types, including the following formats: