The 001 file type is primarily associated with hjsplit file. Some parts of the code are under the bsd 3clause license. Split files can be joined using hjsplit or other similar software, or with the command prompt in windows. It splits files into smaller pieces, or chunks, using the file format of yourfile. Also there is unrar license restriction for some parts of the code. The most of the code is under the gnu lgpl license.
Most of the articles or binary files that you download from binary newsgroups will be in a rar format such as filename. Convert video files between avi, mpeg, vob, wmv, and other common video file formats. When a user creates a copy of his or her hard drive with a. A 001 file is the first file of a split archive created with various file splitting and joining utilities.