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Now, you will most likely not encounter a MacBinary Encoded BIN file unless you find an old BIN file on a non-Mac or download an old BIN file from the Internet. Then, the forks would be split apart when transferred back to the Mac OS.Īs Apple moved away from the fork-based HFS in the 2000s, the MacBinary format became seldomly used. When transferring a file to a non-Mac system, the two forks would be encoded in the MacBinary format as one BIN file. To prevent this from happening, the Dennis Brothers, Harry Chesley, Yves Lempereur, and others developed the MacBinary format to combine the two forks in a compressed archive.

The Classic Mac OS handled the two separate forks as a single file, but when transferring files to another computer, the non-Mac system would not treat the two forks as a single file, which led to lost data. The "resource fork" stored the structured data for the file, and the "data fork" stored the unstructured data. Before Mac OS X, Macintosh computers running the Classic Mac OS in the 1980s and 1990s stored files in two separate "forks" because of data limitations.