Problem executing an exe executable!

Hello
I'm trying to run a exe file named butil.exe from within a java
application.
This is my code:

      Process p = run.exec("d:\\modec160\\p_21\\butil.exe");
      BufferedReader err =new BufferedReader(new
InputStreamReader(p.getErrorStream()));
      BufferedReader in = new BufferedReader(new
InputStreamReader(p.getInputStream()));
      String line;
      while ((line = in.readLine()) != null) {
        System.out.println(line);
      }

      while ((line = err.readLine()) != null) {
        System.out.println(line);
      }

      int exitValue = p.waitFor();
      System.out.println("Process exit value: " + exitValue);

exitValue is always 2.
Like many other programms 'butil' when run without any arguments will
give a usage discription,
but I don't have anything.
When I give its arguments,it should create a text file but I don't have
it too.
If it is important butil belongs to Btrieve,an old record manager and
I'm using JDK1.4 on winXP

Any thing you think may help,may really help.

Thank you.