File.get{Free,Total,Usable}Space throws NullPointerException on Windows 98,
if File Object is created as File("tmp"); where tmp is windows file

C:\>uname -a
Windows_98 JLAB408 4 10 586

C:\>c:\jdk\win\bin\java -version
java version "1.6.0-beta2"
Java(TM) SE Runtime Environment (build 1.6.0-beta2-b86)
Java HotSpot(TM) Client VM (build 1.6.0-beta2-b86, mixed mode)

<Code>
import java.io.File;
public class TestDS {
  public static void main(String... args) throws Exception{
    
     File f = new File("tmp");
     if (!f.exists()) {
        f.createNewFile();
     }
     System.out.println(f.getFreeSpace());
     System.out.println(f.getUsableSpace());
     System.out.println(f.getTotalSpace());
     
     }
  }
</Code>

<Result>

C:\>c:\jdk\win\bin\java TestDS
Exception in thread "main" java.lang.NullPointerException
        at java.io.Win32FileSystem.getSpace0(Native Method)
        at java.io.Win32FileSystem.getSpace(Win32FileSystem.java:565)
        at java.io.File.getFreeSpace(File.java:1619)
        at TestDS.main(TestDS.java:9)

</Result>