Keen for a free ISAPI rewriter? Do you have php on a windows server rather than apache? Then check out this Free Windows ASAPI rewriter - https://archive.codeplex.com/?p=iirf
It handles RewriteCond as well as Rewrite, and is great at rewriting url’s for SEO purposes.
As an alternative, you consider the ISAPI rewrite
(copying some old posts from an old forum of mine that I wish to keep)