code from flash pro CS5 to Flash Builder 4

[Mikey186]

does anyone know how to get the code from flash CS5 to work to Flash builder 4?

heres the code:

import flash.filesystem.File;
import flash.filesystem.FileMode;
import flash.filesystem.FileStream;

movieClip_1.addEventListener(MouseEvent.CLICK, fl_SaveFile);

var fl_FileDataToSave:String = "Text to save to file.";

var fl_SaveFileStream:FileStream = new FileStream(); // FileStream used to write to the file

var fl_SaveFileChooser:File = File.documentsDirectory; // Default to the documents directory
fl_SaveFileChooser.addEventListener(Event.SELECT, fl_WriteFileHandler);

// Opens a Save As dialog box for user to specify a file name
function fl_SaveFile(event:MouseEvent):void
{
fl_SaveFileChooser.browseForSave("Save As:");
}

// Write data in fl_FileDataToSave variable
function fl_WriteFileHandler(event:Event):void
{
fl_SaveFileChooser = event.target as File;
fl_SaveFileStream = new FileStream();

fl_SaveFileStream.openAsync(fl_SaveFileChooser, FileMode.WRITE);

fl_SaveFileStream.writeMultiByte(fl_FileDataToSave, File.systemCharset);

fl_SaveFileStream.close();
}

[Mikey186]

Or is there a reference to it?