How to Mount a VHDX to Windows using a PowerShell Script

To mount a VHDX to Windows as a drive using PowerShell, run the command:

Mount-VHD -Path c:\my-folder\MyVirtualDisk.vhdx

or

Mount-VHD -Path c:\my-folder\MyVirtualDisk.vhdx -ReadOnly

Then remove the drive again by using:

Dismount-VHD -Path c:\my-folder\MyVirtualDisk.vhdx

This method can be used to copy files into a VM, for example, or  to copy files from one VM to another, or from VM to host, etc. But if the VM is currently running, the virtual disk cannot be mounted. In that case you neeed to use this command.