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To get the answer, just put a decimal point in the number "50"—my first Microsoft product was MS-DOS 5.0.
It still has excellent compatibility with MS-DOS software, including Windows 3.1 and earlier, and many of the built-in ...
It’s interesting that they would preserve what’s arguably the least popular version of MS-DOS in this way, but then again there’s something to be said for having a historical record on what ...