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The linked article is about Scott Hanselman's decision to open-source the restored and updated version of MS-DOS 4.0 that he has been working on. Hanselman explains the historical significance of MS-DOS 4.0 and his motivation to preserve and share this piece of computing history. The article also discusses the technical aspects of the project, including the challenges he faced in reverse-engineering the original code and the tools he used to modernize the operating system while maintaining its authenticity.