For native windows launcher is possible to define the ICO file:
products {
windowsIco = file("$buildDir/resources/icons/foo.ico")
}
Unfortunately Wuff accepts only the old file format (for Eclipse 3.X launcher). For Eclipse 4.X launcher this format has changed. It is necessary to update the class IconExe (org.eclipse.pde.internal.swt.tools.IconExe)