Hi @ginahoy ,
If you simply have a .VHDX file without any configuration files, you will likely need to create a new virtual machine and attach the .VHDX file to it.
If you have a whole folder of the virtual machine, you can most likely import it using the Hyper-V Manager tool or PowerShell.
Export and Import virtual machines
https://learn.microsoft.com/en-us/windows-server/virtualization/hyper-v/deploy/export-and-import-virtual-machines
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Best regards,
Leon