As I mentioned in my previous reply, the name of the ISAPI goes in two places. On the Computer Management Console, navigate to the IIS tab, and then navigate to the default web site. Right click and select properties. Click on the ISAPI filters tab and click on ADD button. The filter name is PHP. Click on the browse button and navigate to where the following file is located "php4isapi.dll". Click on the file name and the full path is entered in the Executable box. Click on OK.
Next select on the "home directory" tab. Click on the configuration button and select add. Click on browse button and navigate to the "php4isapi.dll" and select it. This should put the full path in the executable box. On the extension box type in .php. Repeat the above procedure to add more extensions such as .php3.
One word of warning though. You should install PHP under the document root. Otherwise, I could not get the ISAPI method to work. For example, my document root is c:\inetpub\wwwroot. I installed PHP in c:\inetpub\scripts\php, perl in c:\inetpub\scripts\php.
Hope this helps.
