User Experience Guidelines
The primary responsibility of any Control Panel item is to display a window that allows the user to view and manipulate settings. See Control Panels user experience (UX) guidelines for the Windows Vista for the behavior and design of Control Panel items. The guidelines discussed in that topic show a task flow method of organizing a Control Panel item. This places the most important settings on a home page. Less frequently used settings are placed on spoke pages or accessed from links in a side pane.
The Windows Vista Control Panel includes many Control Panel items that follow these guidelines, such as Windows Update, Ease of Access Center, or Network and Sharing Center. Other Control Panel items use the tabbed dialog property sheet format as in earlier versions of Windows. Examples include the Mouse item and Internet Options. Use of the property sheet format should be discontinued. If you create new Control Panel items for Windows Vista, you should follow the task flow guidelines.
In the past, Control Panel items were packaged as .cpl files. That is no longer necessary. New Control Panel items should be implemented as a standalone .exe file or as a command-line flag option for the application's main executable file.
On 64-bit systems, 32-bit Control Panel items are displayed in the Control Panel when the View 32-bit Control Panel Items folder option is selected. The 32-bit items must be located in the %SystemRoot%\SysWOW64 folder to be displayed. They do not require any further registration.