MSC - Microsoft Management Console Snap-in Control File is a file extension that is mainly used for MMC. This program is used for configuring and monitoring Windows computer systems and contains different snap ins. You can use these for device management and much more. You can use this extension for system even monitoring as well. Everything is published by MSDN. This extension can be accessed by going online. The download is free, and is definitely worth it. The extension is packed with great features that can benefit you in some way. It is also included with Windows operating systems.