It is easy to use PHP with Visual InterDev and have all the highlighting show up correctly. Create a file, e.g. test.php, in Visual InterDev. Right click the file in the project explorer and choose "Open with". Select the "HTML editor" and click the "Set as Default" button. Voila! All the editing features you are used to using in ASP pages now work for PHP. To make the integration even better, turn on ASP_TAGS in the php.ini file so you can use <% and %> (otherwise you would have to use <SCRIPT Language=PHP></SCRIPT> to get the highlighting to work correctly because Visual InterDev doesn't know about <? and ?>. For more information read the article "Choosing and Alternate Editor" in the Visual InterDev documentation. Ref. http://msdn.microsoft.com/library, Visual Tools and Languages, Visual InterDev, Product Documentation, Getting Started with Visual InterDev, Introducing Visual InterDev, Editing Basics, Choosing and Alternate Editor.