Ionic’s ISAPI Rewrite Filter is an URL rewriting ISAPI filter for IIS 5.0, 5.1, 6.0 and 7.0. It could be found at http://www.codeplex.com/IIRF. It has a detailed online help file, a long list of examples, and a discussion board that has more than 650 discussions. With the help of this filter we have been able to use WordPress in Windows with Pretty Permalinks enabled for nearly a year now without problems. Below are the contents of the iirf.ini file we use.

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