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https://deploymentbunny.com/2013/12/19/powershell-is-king-convert-wim-to-vhdvhdx-with-support-for-gen-1-and-gen-2-biosuefi-and-then-some/
PowerShell is King – Convert WIM to VHD/VHDX with support for Gen 1 and Gen 2 (BIOS/UEFI) and then some…