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MacBinary III (often just referred to as MacBinary) is a format for representing all the information in a Macintosh file (data and resource fork) in one binary file. It is useful for storing a Macintosh file on a non-Macintosh system for later retrieval. Unlike BinHex, MacBinary is a compact format, but it cannot be passed through most electronic mail systems. MacBinary files typically have names ending with the extension ".bin".

Fetch can get and put files in MacBinary III format, as well as get files in MacBinary I and MacBinary II format (earlier versions of the MacBinary standard). See the upload formats help topic for information about automatically encoding files in MacBinary when uploading.

Fetch automatically recognizes and decodes MacBinary files when downloading, although automatic recognition can be turned on and off by either:

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