I have installed Windows Server 2012 Release Candidate Core on a Dell Precision 470 with two single core Xeon processors (I actually installed it as GUI, and then switched to Core, but I had the same results when I installed as Core)
When I try to get a Network Connection window, by typing "control ncpa.cpl" in PowerShell, It responds "Class not Registered". I checked to make sure ncpa.cpl is in the "\Windows\System32" folder, and it is.
"Control" should produce the control panel window, but it also responds "Class not Registered".
Other *.cpl files such as hdwwiz.cpl (Device Manager), timedate.cpl (Date and Time), and sysdm.cpl (System Properties) work and display a pop-up window, but inetcpl.cpl (Internet Properties) does not do anything.
Microsoft is conducting an online survey to understand your opinion of the Technet Web site. If you choose to participate, the online survey will be presented to you when you leave the Technet Web site.