The 001 file type is primarily associated with HJSplit File. HJSplit is a popular freeware program used to split and recombine files, making them easier to send and receive. Split files can be joined using HJSplit or other similar software, or with the Command prompt in Windows.

Fax image file created by various fax devices and software programs; may contain the image of the first page of a multi-page fax, while subsequent pages use the extension ".002," ".003," etc.; used to store the image data from received faxes.

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