The .012 file extension is most commonly associated with split file archives. When a program, such as WinRAR, is used to combine a large batch of files into a single file archive, the archive can be split by a number of file splitting applications. This allows for easier distribution of the file online and allows a user to save the file archive across multiple computer disks. When the file archive is split into separate volumes, each volume of the archive is given its own file extension, such as .001, .002, .003, etc. The .012 file extension is most commonly assigned to the twelfth volume of the split file archive. In order to extract the contents of the archive, all volumes must be present.
The .012 file extension is also used for Winfunktion Mathematic v8.0 Julia fractal files.
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