IfyourPCopenstheRNCfile,butit'sthewrongapplication,you'llneedtochangeyourWindowsregistryfileassociationsettings.Inotherwords,WindowsisassociatingRNCfileextensionswiththewrongsoftwareprogram.
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If your PC opens the RNC file, but it's the wrong application, you'll need to change your Windows registry file association settings. In other words, Windows is associating RNC file extensions with the wrong software program.