Make COFF set OS as Windows (#439) #473

Job	Run time
docs	1m 51s
ci / Build	8m 25s
windows / Test Windows	2m 41s
macos / Test macOS	1m 25s
ci / Lint	1m 10s
ci / Test (0)	6m 21s
ci / Test (1)	6m 36s
ci / Test (2)	14m 15s
ci / Test (3)	6m 14s
ci / Test (4)	9m 43s
ci / Test (5)	5m 39s
ci / Test (6)	16m 7s
ci / Test (7)	8m 5s
ci / Test (8)	6m 17s
ci / Test (9)	3m 48s
ci / Publish Unit Tests Results	1s
	1h 38m 38s

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