The system calls each application's Close function when an application calls the RegCloseKey function to close the HKEY_PERFORMANCE_DATA key. This function performs any cleanup required by the application's performance data collection mechanism. For example, the function could close device handles opened by the CreateFile function, or close a handle to a file mapping object.
Use the following function prototype for your Close function.
DWORD WINAPI ClosePerformanceData();
The name ClosePerformanceData is a place-holder for an application-defined name.
The function should return ERROR_SUCCESS.