Appstream instance user permissions

I've created an appstream instance for our users to login into and use an application. I have set the login to "desktop" view as I need the users to be able to complete various tasks within the desktop session. One of those tasks include copying data from the root of the C:\ drive. Is there a way I can associate users as being local administrator so that they don't just see a home and temporary folder. I need them to see the full volume of the C:\ drive.