How to loop through files and update the file name using Flex AIR WindowedApplication

gistfile1.txt

<?xml version="1.0" encoding="utf-8"?>
<s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009" 
					   xmlns:s="library://ns.adobe.com/flex/spark" 
					   xmlns:mx="library://ns.adobe.com/flex/mx"
					   xmlns:ns="http://flex.apache.org/experimental/ns" 
					   xmlns:file="com.flexcapacitor.effects.file.*"
					   >
	
	<fx:Script>
		<![CDATA[
			import mx.collections.ArrayCollection;
			import mx.events.FlexEvent;
			
			protected function button1_clickHandler(event:MouseEvent):void
			{
				browseForFile.play();
				
			}
			
			protected function browseForFile_selectHandler(event:Event):void
			{
			}
			
			protected function loadfile1_totalCompleteHandler(event:Event):void
			{
				var files:Array = loadFile.filesArray;
				var newFile:File;
				var data:String;
				var fileStream:FileStream = new FileStream();
				
				// Error: Error #3012: Cannot delete file or directory.
				//  at flash.filesystem::File/copyTo()
				// -- error because file already exists and overwrite was false
				
				// Error: Error #2029: This URLStream object does not have a stream opened.
					
				for each (var file:File in files) {
					newFile = new File(file.nativePath + ".txt");
					file.copyTo(newFile, true);
					
					fileStream.open(newFile, FileMode.WRITE);
					data = file.data.readUTFBytes(file.data.length);
					data = data.substr(data.lastIndexOf("Content-Description"));
					fileStream.writeUTFBytes(data);
					fileStream.close();
					//newFile.data.writeUTFBytes(data);
					trace(data);
				}
			}
			
		]]>
	</fx:Script>
	
	<fx:Declarations><!-- Class declarations below are from the FCLibary -->
		<file:BrowseForFile id="browseForFile" allowMultipleSelection="true" 
							select="browseForFile_selectHandler(event)">
			<file:multipleSelectionEffect>
				<file:LoadFile id="loadFile" totalComplete="loadfile1_totalCompleteHandler(event)"
							   filesArray="{browseForFile.fileList}"/>
			</file:multipleSelectionEffect>
		</file:BrowseForFile>
	</fx:Declarations>
	
	<s:Button label="do stuff" click="button1_clickHandler(event)"/>
</s:WindowedApplication>