002 is a file extension used by various data archiving programs when creating multipart archives.

File with 002 extension is the second part of multipart archive. In order to extract such archive, all parts need to be present in a single folder. Multipart archives are typically used for large amount of data. Archiving tools allow users to set the size of a single archive part to make it easier to save it to a particular type of storage device, for example, a CD or DVD.