Seeing directories of running docker container


I Build a Docker image. And I want to see what is in the docker container. So I tried running the following command into PowerShell:

docker exec -ti c4609ec41e73 PowerShell

A PowerShell is launched but I cannot do anything in there. All I see is

Windows PowerShell Copyright (C) 2016 Microsoft Corporation. All rights reserved.

How can I launch this PowerShell into the running container, so that I can check what exactly is installed?

Any help would be appreciated! Thank you