An old version of Windows Core OS leaked to Internet. This is an ARM32 based build with version code “Polaris“. Windows Core OS was designed as a universal base for Windows that could be used to combine specific features of a device.
This allows Microsoft to put together all the pieces of the puzzle for a new device instead of creating a new version of the Windows 10 especially for her.
So "Polaris" was a desktop shell for Windows Core OS. It was intended to provide a familiar look to the default Windows shell, but was built with state-of-the-art technology.
The following picture is the screenshot of Polaris OS running the actual desktop shell.
Polaris was built specifically for Windows Core OS running on PCs. There was also the Andromeda shell for mobile Appliances and a mixed reality shell, Oasis.
Microsoft canceled both Polaris and Andromeda in 2018. These projects were replaced by Windows 10X.
The leaked code is an ARM32 version of Polaris, in build 16299. Unfortunately, this version of Polaris does not have any functional shell. Once you launch it, you will see a UI placeholder with a different colored Windows logo.
