Windows forerunner

This time we are looking on the crossword clue for: Windows forerunner.
it’s A 18 letters crossword puzzle definition. See the possibilities below.

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Possible Answers: DOS, MSDOS.

Last seen on: –Universal Crossword – Jul 29 2020
The Washington Post Crossword – May 30 2020
LA Times Crossword 30 May 20, Saturday
Universal Crossword – May 12 2020
The Washington Post Crossword – Dec 23 2018
LA Times Crossword 23 Dec 18, Sunday