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Millions of Windows XP disks secretly included Microsoft's failed search assistant to keep pirates at bay — "Bob was actually more useful dead than alive"

Before Windows introduced its modern GUI system, Microsoft was well-known for its iconic command-line operating system, MS-DOS (Microsoft Disk Operating System) throughout the 1980s and early 1990s.
Houston Chronicle

How to Configure Config SYS

While Windows has moved away from using Microsoft Disk Operating System as a base, versions of DOS still persist. Some programs refuse to run in modern versions of Windows and require a DOS emulator.