[DARIUS1]

import flash.display.*;
     import flash.text.*;
     import flash.events.*;
     import flash.geom.*;
 
     import fl.events.*;
     import fl.controls.*;
 
     import flash.net.*;
     import flash.utils.*;
 
     import fl.controls.dataGridClasses.*;
     import fl.data.*;
     import fl.controls.listClasses.*;
 
   saveBtn.addEventListener(MouseEvent.CLICK, saveBtnClickHandler);
 
 
           function saveBtnClickHandler(evt:MouseEvent):void {
                 var ba:ByteArray;
                 var saveFile:FileReference;
 
                 ba = new ByteArray();
                 ba.writeByte(0xEF);
                 ba.writeByte(0xBB);
                 ba.writeByte(0xBF);
                 ba.writeUTF(txt.text);
                 saveFile = new FileReference;
                 try {
                       saveFile.save(ba,"text.txt");
                 }
                 catch (e:Error) { trace(e) }
           }

txt - поле ввода
saveBtn - кнопка сохранения