This is very simple, I don't know why any of us thought of this earlier:

  1. Create a .htaccess file with this as its content:
     

     RewriteEngine on
     RewriteCond %{HTTP_HOST} ^agilo.acjs.net$ [NC]
     RewriteRule ^(.*)phps$ http://agilo.acjs.net/catchphps.php?page=$0 [L]
     
     Be sure to change the URLs (bold parts)!

  2. Next, create a file called "catchphps.php" in your root folder of your site.
     Make this its content:
     

 <?
  $page = $_GET['page'];
 
  if ((file_exists($page)) && (preg_match("/(.*).phps$/", $page))) {
   show_source($page);
  } else {
   echo "Error!";
  }
 ?>
     

  3. That's it!  You're done!

 

Explanation

1. The ".htaccess" file redirects all requested .phps files to http://<yoursite>/catchphps.php
2. "catchphps.php" catches the name of the .phps file (?page=bla.phps).
3. "catchphps.php" checks to see if the file exists and ends with .phps (security).
4. "catchphps.php" shows the source of the .phps file.

The best thing is; the URL in the URL bar doesn't change!! :D