Make COFF set OS as Windows #472

Job	Run time
docs	1m 35s
macos / Test macOS	2m 5s
ci / Build	7m 49s
windows / Test Windows	2m 38s
ci / Lint	1m 27s
ci / Test (0)	5m 46s
ci / Test (1)	5m 58s
ci / Test (2)	4m 53s
ci / Test (3)	12m 13s
ci / Test (4)	9m 9s
ci / Test (5)	6m 19s
ci / Test (6)	5m 20s
ci / Test (7)	5m 24s
ci / Test (8)	5m 36s
ci / Test (9)	4m 14s
ci / Publish Unit Tests Results	1s
	1h 20m 27s

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