I want to replace all instances of an embeded space %20 with an underscore. I don't see anything here that would allow a URL with encoded spaces such as http://localhost/folder/this%20is%20my%file.aspx to http://localhost/folder/this-is-my-file Any ideas? Thanks, Michael

The original rule that you have should work here. When you say that rule does not work - does it mean that it is not executed or it results in error?

Try using the urlencode function: <action type="Rewrite" url="index.php?title={UrlEncode:{R:1}}" />

In the upcoming RTW release, URL rewriter will set another IIS server variable - UNENCODED_URL - to contain the raw URL exactly as it was requested by the browser (all encoding preserved). HTTP_X_ORIGINAL_URL will still contain decoded URL.

Ok. I think this is clear to me know. This looks like a common approach used by PHP apps, where everything is rewritten to index.php and then the app figures out what to do based on original url. I'll let you know what we'll decide on this.

Do you need to use original encoded URL to construct the links in your web application only? Or do your rewrite rules rely on the URL being encoded when doing pattern matching?

The fix for non-ascii characters will not change this behavior. IIS gets already decoded URL from https.sys and that is used to set HTTP_X_ORIGINAL_URL as well as any other server variables. This is not specific to URL rewriter and this is how it is in IIS 6. Could you explain why it is a problem for...