Writes binary data to a value in the registry.
BOOL WriteSectionBinary( LPCTSTR lpszSubSection, LPCTSTR lpszEntry, LPBYTE pData, UINT nBytes );
The lpszSubSection parameter is not the absolute path for a registry entry. It is a relative path that is appended to the end of the default registry key for your application. To get or set the default registry key, use the methods CWinAppEx::GetRegistryBase and CWinAppEx::SetRegistryBase respectively.
If the key specified by lpszEntry does not exist, this method will create it.