A better option might be a rewrite tool like iFinity's URL Master, or the IIS 7 URL Rewriter module.

Jeff

It's unlikley you'll be able to setup a redirect for that using the SiteUrls file.  If it is throwing an error, it could be because of an invalid regex expression. You'd have to check and make sure what the error is.

If it's a one off redirection, you could see if you have access to the IIS settings for entering a redirect.  Even if you're on a shared host, you sometimes get an option for entering in specific Urls to redirect.

The problem you're going to have trying to redirect a 'linkclick.aspx' handler is that the linkclick module is a separate piece of code to the Friendly Url Provider / Url Rewriter.   You may mess up all of your linkclick.aspx entries if you don't carefully redirect it.