I am having problems with the following method in a Serializable class:

        public void SaveMap() {
     // Three different ways to open a file
     // a) With a handle to an extended attribute on file m_Path (Which is a directory)
     // b) With a handle to a file in the directory m_Path
     // c) Opened from a filespec to a file in the directory m_Path
   
     // I wish for the (a) version to work correctly
   
          IntPtr Handle = Win32.CreateFile(m_Path + ":eDB",
                                           Win32.GENERIC_WRITE,
                                           0,
                                           IntPtr.Zero,
                                           Win32.OPEN_ALWAYS,
                                           0,
                                           IntPtr.Zero);
          IntPtr Handle2 = Win32.CreateFile(m_Path + "-.map",
                                           Win32.GENERIC_WRITE,
                                           0,
                                           IntPtr.Zero,
                                           Win32.OPEN_ALWAYS,
                                           0,
                                           IntPtr.Zero);
          FileStream outStream = new FileStream(Handle, FileAccess.Write, true);
          FileStream outStream3 = new FileStream(Handle2, FileAccess.Write, true);
          FileStream outStream2 = new FileStream(m_Path
                                                + ".map", FileMode.Create, FileAccess.Write);

          XmlSerializer XMLformat = new XmlSerializer(typeof(DropBoxMap), "DropBoxMap");

     // Serialize the object to all three files

          XMLformat.Serialize(outStream3, this);
          XMLformat.Serialize(outStream2, this);
          XMLformat.Serialize(outStream, this);

     // Close all three files

          outStream.Close();
          outStream2.Close();
          outStream3.Close();
        }

After I step through this method I diff all three files.
      The files:     m_Path + ".map"
      and        m_Path + "-".map"
      are identical (These are going to regular files)

      The file       m_Path + ":eDB"

has some garbage at the end of the file. This is the extended attribute. This file has the same
contents as the previous two, except it has some garbage at the end. It looks like the final flush
was executed twice. A part of the end of the file was repeated.

A tail of the good file is:

    <Created>2005-10-19T09:14:37.446856-05:00</Created>
    <Modified>2005-10-19T09:14:37.446856-05:00</Modified>
    <SequenceID>2</SequenceID>
    <SyncState>Current</SyncState>
  </Elements>
  <m_Path>C:\Documents and Settings\rschaefer\Desktop\Fred</m_Path>
  <NextNodeID>5</NextNodeID>
  <Dirty>true</Dirty>
</DropBoxMap>

A tail of the extended attribuge file is:

    <Created>2005-10-19T09:14:37.446856-05:00</Created>
    <Modified>2005-10-19T09:14:37.446856-05:00</Modified>
    <SequenceID>2</SequenceID>
    <SyncState>Current</SyncState>
  </Elements>
  <m_Path>C:\Documents and Settings\rschaefer\Desktop\Fred</m_Path>
  <NextNodeID>5</NextNodeID>
  <Dirty>true</Dirty>
</DropBoxMap>irty>
</DropBoxMap>xMap>

Of course it refuses to Deserialize with this junk at the end of the file!
Any suggestions on how to workaround this ?
I have tried this Visual Studio .Net 2003 and Visual Studio 2005.