Before Windows, there was MS-DOS that's the Microsoft Disk Operating System, if you're unfamiliara text-based, command-line interface operating system that was the way into managing files and launching applications on non-Apple computers.

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Before Windows, there was MS-DOS that's the Microsoft Disk Operating System, if you're unfamiliara text-based, command-line interface operating system that was the way into managing files and launching applications on non-Apple computers.