This post is obsolete. Read New post How to run PHP in Webmatrix (updated) ? regarding same topic. Do you have tried running PHP application in webmatrix. You can run them as well your ASP.NET application. Here is two solution for you if you are unable to run your own PHP application on your computer. 1. try to check C:\Program Files (x86)\IIS Express\PHP/V if you are unable to find this directory then it's means you don't have install PHP for webmatrix. You need to install them through Web plateform ......