Files that contain the .0 file extension are created by the DoubleSpace disk compression application that was supplied with the MS-DOS operating system, versions 6.0 and later. The DoubleSpace application was created to increase the amount of information a user could save to a hard drive or a disk. When the information is compressed with this application, the .0 file extension is created.
The .0 extension is also given to files created with the Hacha archive splitting software application. When an archive file is split into smaller volumes using the Hacha software, the application assigns a series of numbers corresponding to each archive volume. The .0 extension is given to the first volume in the series and would appear as filename.zip.0.
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