Writing/Deleting files on a .FLP virtual floppy image

I have a virtual image mounted as Floppy Drive 1 and I am trying to move a file to it.

This is my Powershell:

$server = Connect-VIServer -Server $vCenterAddress -Port $vCenterPort -Protocol $vCenterProtocol -User $vCenterUsername -Password $vCenterPassword

$ds1 = Get-Datastore -Server $server $sourceDatastore

New-PSDrive -Location $ds1 -Name source -PSProvider VimDatastore -Root '\'

Copy-DatastoreItem  source:$sourceFolder$sourceFilename   -Destination A:platformConfig.xml-jhm

I am getting the following error:

Copy-DatastoreItem : The specified destination folder 'A:\' does not exists. Use the Force parameter to force operation.

Do I need to do something special to be able to write to the virtual A: drive? Is it under a name different from A:?

Thanks.

John