AFAIK no version of Windows ships with native support for RAR (including Win10). Some file managers have built in support for RAR and 7z (eg Total Commander and maybe Directory Opus), unsure if they add a shell handler that Windows Explorer can use though.
7zip v 9.20 doesn't add anything to Windows Shell to make RAR's show up as folders, maybe its in the 9.38 beta.
BR
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