In an effort to clean up the URLs my WordPress-based site generated, I wanted to implement an ISAPI rewrite. You see, because I host my site on IIS 6, turning on WordPress’ Permalinks required an “/index.php/” in all of my URLs. I wanted a way to eliminate the “/index.php/” portion of the URL. If I were hosting this site on an Apache server, it would be a no-brainer as Apache has the mod_rewrite module available, and would be able to serve URLs without the /index.php/ out of the box. According to http://httpd.apache.org, the mod_rewrite module “uses a rule-based rewriting engine, based on a PCRE regular-expression parser, to rewrite requested URLs on the fly.” It is this module that allows the intricate URLs created by WordPress to be presented in a friendly, cleaner manner – allowing http://jkshay.com/index.php/implementing-an-isapi-rewrite-for-iis to be accessed with a URL such as http://jkshay.com/implementing-an-isapi-rewrite-for-iis-6.