You can create your own Control Panel objects. Most Control Panel objects supply only a single secondary window, typically a property sheet. Define your Control Panel object to represent a concrete object rather than an abstract idea.
Every Control Panel object is a dynamic-link library. To ensure that the dynamic-link library can be automatically loaded by the system, set the file's extension to .CPL and install it in the Windows System directory.
Note 
The system automatically caches information about Control Panel objects in order to provide quick user access, provided that the Control Panel object supports the correct system interfaces. For more information about developing Control Panel objects, see the documentation included in the Win32 SDK.