Because IIS does not support mod_rewrite module for rewriting URLs, if you are running WordPress on Windows IIS,whenever you try to use Permalinks, you always get something like this:

http://www.yourdomain.com/index.php/2006/09/02/…../

this ISAPI filter can remove ugly "index.php" from the URL automatically.it’s easy to use,just install it and no further configuration is necessary.

download wp_url_rewriting

Key benefits:

• Speed.
  
  this URL Rewriting engine is writing in C++,because it’s designed dedicated for WordPress,so the program’s logic is very simple and no regular expression is used.it’s extremely faster than other rewriting engines on the IIS platform.
• Support Multiple WordPress sites on one server.
• No configuration is needed
  
  This URL Rewriting engine will automatically detect all WordPress sites on your server,and generate URL rewriting rules for each of them.

Living Demo

You can take my site as a living demo, navigate through my sites,watch the ‘pretty’ address in the browser.

Limitation

You must have administrator privileges on the target server in order to install this plugin.

Installation

1). Copy wp-url-rewriting.dll to the target machine and register it as an ISAPI filter using IIS MMC snap-in. wp-url-rewriting.dll can be registered at either the site level or the global level.Note:if WordPress is not installed in the root directory of your site,you should setup it as a virtual directory.

2). after register,Login to your WordPress admin panel->options->Permalinks,make sure you have removed the index.php from your permalink structure.

3). Do a little hack to WordPress file ‘link-template.php’ to make paging works well for categories:(NOTE: You don’t need to do this step if you are using WordPress 2.3.0 or newer)

open file /wp-includes/link-template.php and find the following code:

function get_pagenum_link($pagenum = 1) {

 global $wp_rewrite;

 $qstr = $_SERVER['REQUEST_URI'];

 $page_querystring = "paged";

 ...

}

Replace it with:

function get_pagenum_link($pagenum = 1) {

 global $wp_rewrite;

 $qstr = $_SERVER['PATH_INFO'];

 $page_querystring = "paged";

 ...

}

Revision History

• version 2.1 -2007-8-29
  • Fixed a bug that may cause rewriting failed if there are many blogs under a single site.
• version 2.0 -2007-8-17
  • no configuration file needed.This version automatically generate URL rewriting rules for each WordPress sites on the same server.
  • Support multiple WordPress sites on the same server.you can install this filter at the global level to support multiple WordPress sites on your server.
• version 1.1 - 2006-11-1
  • optimize algorithm.
  • exclude directories : wp-admin,wp-content from the url rewriting rules.
• version 1.0 - 2006-9-2
  • Initial Version

this ISAPI filter has been build with /MT switch(multithread, static CRT) ,if you failed to load this plugin,download vcredist_x86.exe from microsoft,run it on the target computer,this installs all Visual C++ libraries as shared assemblies.

Please feel free to report any bugs.

This project is licensed under GNU General Public License 2.0.