With version 8.5.1 and later, the 'Expand-RMADBackup' cmdlet is available through the RMAD management shell module in PowerShell. This will allow you to unpack the backup file, however, installation of RMAD 'Core Components' will be necessary.
You cannot install PS Management Shell tools (or Windows Administrative Tools Extension) alone without Core Components as the Core Components include all necessary binaries and libraries to for the Powershell cmdlets to work. This means installation of the RMAD console will be done as well.
To use the Expand-RMADBackup cmdlet: