很是简单，基本就是二句主要代码解决。。

  replaceIco = function( hwnd, icoPath ){
  import process;
  import winex;
  import win.image;
  var ico = win.image.loadIconFromFile( icoPath );
  ::PostMessage( hwnd, 0x80/*_WM_SETICON*/, 0/*_ICON_SMALL*/, tonumber(ico) );
 }

需要的拿走