public static void Unregister()
{
if (!registered)
{
return;
}
// In this sample the extension owns the file extension and ProdId, which makes it save to remove
// it during unregistration. This is often not the case for file extension for application by other vendors.
// In those cases the file extension and ProdID should not be removed.
RootKey.Unregister(FileExtension, ProgId);
registered = false;
//// SHChangeNotify(SHCNE_ASSOCCHANGED, SHCNF_IDLIST, NULL, NULL);
}