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Here is the official word from Microsoft TechNet, The C:\Users folder is shared when any sub folders from C:\Users\<username>\ is shared. The article is stale and mostly unhelpful, but worth knowing to complete the story.
Before you can share files or folders with other users on your network, you must make sure that File and Printer Sharing is enabled. You can do this by going to the Control Panel (Start, Control Panel) and selecting the Network Connections applet.Right-click on your network connection and select Properties.efore you can share files or folders with other users on your network, you must make sure that File and Printer Sharing is enabled. You can do this by going to the Control Panel (Start, Control Panel) and selecting the Network Connections applet.