Unfortunately you can only use one File directive. You could use include_stdout directive to pull in your files as a script though.
Basically your script would need to build an Input instance for each file and output in a for loop, for instance.
Write-Output from PowerShell can do the task.
Something like the following maybe. Has not been tested.
Please see the .cmd file in the DHCP Audit log section for how to embed a powershell script in CMD.
You will need to update your Route as well (or let the auto-built route handle it) .