Polaris was the codename for a cancelled Windows Core OS-based release targeted towards low-cost laptops and tablets.
The Polaris desktop shell features were ultimately moved into the Windows Andromeda OS as a separate desktop composer.
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RUN IN POWERSHELL AS ADMIN TO SEE WIM FILE INFO: DISM /Get-ImageInfo /imagefile:
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Details for image : 16299.241.rs3_release_svc_sec.180102-2128.wim
Index : 1
Name : POLARIS_INSTALL
Description :
Size : 1,844,981,010 bytes
Index : 2
Name : POLARIS_BOOT
Description :
Size : 1,845,926,023 bytes
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