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webosusa: this mod is for search engine optimized urls, it's an alternative to DSEFU
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spacecadet: PM info about your site/server, i'll help you debug
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nano1018: XC SEO is pretty much the same as DSEFU (except free). XC SEO hasn't yet been modified to work on IIS. Both mods could theoretically work fine on Windows/IIS, but you have to install rewrite (which is available for IIS). or even better, install Apache, you'll see better performance and most mods will now work