How to allow ~user/xxx.php on Windows XP

Hello, everyone: I am new to PHP on windows. I could not get http://localhost/~username/my.php work on Windows XP. Here is what I have: Windows XP Pro + Appache 2.0.40 for Windows + Php 4.3 I followed tutorial posted at http://internetmaster.com/installtutorial/. It works fine when .php file is in the DocumentRoot directory. In my case, it is the default one Apache uses: c:\program files\apache group\...\htdocs However, if I copy the working php file to a user's Apache web directory, it stops working. In other word, http://localhost/test.php works while http://localhost/~myusername/test.php does not work. Any one can help out here? -- Gang Wang