This is reproducable on Windows with jdk 7.

A FileDialog having a non-null owner is displayed a bit off from (0,0), where as a FileDialog with null owner is shown at (0,0). With 6.0, a FileDialog created with null/non-null owner appears at (0, 0).

To reproduce:
Run the below test. If the FileDialog does not appear at (0,0), bug is reproduced

import java.awt.FileDialog;
import java.awt.Frame;

public class Test {
    public static void main(String[] args) {
        new FileDialog(new Frame()).setVisible(true);
    }
}