Help with file uploader, php script, Windows Authentication

Question

I am trying to setup a really basic web-based file uploader that I will expand upon later. I have the flex application working well enough (very basic). However, I have a php script in a secure folder using windows authentication. When I try to send the file to the script, it doesn't seem to like my credentials, and refuses to do anything. I do not get an error message; just nothing happens.
My questions are:
Does anybody know where I should've looked before posting this thread?
Do I even have PHP set up correctly? (At first I just made a txt file and put a .php extension on it, then I tried to setup PHP on the server, but it was a little confusing for me)
Is Windows Authentication the problem?
I do plan on implementing SQL Server in the future (to keep track of Files and user-defined attributes for files), but I do not want to store the files in SQLserver, just their pathnames.
Is there a simple way to use ColdFusion (for free) to acheive this end?
I am somewhat experienced at coding applications, but am totally new to server-side scripts.
This is my php script:
<?php
$tempFile = $_FILES['Filedata']['tmp_name'];
$fileName = $_FILES['Filedata']['name'];
$fileSize = $_FILES['Filedata']['size'];
move_uploaded_file($tempFile, "./" . $fileName);
?>
This is my flex application:
<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
                  xmlns:s="library://ns.adobe.com/flex/spark"
                  xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600">
<fx:Script>
     <![CDATA[
     private var fileRef:FileReference
     private var uploadFilePath:String
     private function selectFile():void
          fileRef = new FileReference();
          fileRef.addEventListener(Event.SELECT, fileRef_select);
          fileRef.browse();
     private function fileRef_select(evt:Event):void
          fileRef.upload(new URLRequest("http://SERVERLOCATION/PDFUploader.php"));
     ]]>
</fx:Script>
     <s:Button top="30" left="5" label="Browse" click="selectFile()"/>
</s:Application>
Thanks to any who take the time to respond.

Answer 1

Hey, so far all I have found is this tutorial.. I'm about to try it out
http://www.smartwebby.com/Flash/external_data.asp