Accessing Administrative Share Using Listener Name Can a SQL Server AG listener name be used to access an administrative share
i.e  \\DB-listener\c$\Somefolder?   

I can RDP using the listener name but can't use the listener name to access the $ shares (as mentioned above).
You cannot use the listener name to access administrative shares on the cluster nodes.  When accessing a cluster network name (which is what a listener is), shares are scoped to clustered shared folders only.

Please see Deploying a two-node clustered file server for reference.