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Windows 10.1, Windows 10.2 I think I've seen this somewhere before...

ArcGIS from ESRI? (It's for Windows only, you may not have heard of it ;)

They probably would have used that if it weren't for the x windowing system.

Why should that stop them.

Similar naming didn't stop Apple from releasing MAC OS 9, when Microware OS-9 already existed.

Or, you know, OSX

Windows X codename Cheetah