Vanity URLs

I'm using Application_BeginRequest within the global.asax file to rewrite URLs on the fly.

Examples:
http://192.168.14.30/clients/design/imex/test.aspx
becomes
http://192.168.14.30/browse.aspx?path=/design/imex/test

but
http://192.168.14.30/default.aspx
still goes to
http://192.168.14.30/default.aspx

The code used is as follows:

Code:

---

<%@ Language="C#" %>
<%@ Import Namespace="System.IO" %>


<script runat=server>

void Application_BeginRequest(Object sender , EventArgs e)
{

          string strClientPath;
          string strCustomPath;

        if ( Request.Path.ToLower().IndexOf("clients" ) != -1 ) {
            strClientPath = Request.Path.Replace( ".aspx", "" );
                strClientPath = strClientPath.Replace( "/clients", "");

            strCustomPath = string .Format( "/browse.aspx?path={0}", strClientPath );

            Context.RewritePath( strCustomPath );
          }
}
</Script>

---

I would like to have a URL like: http://192.168.14.30/clients/design/imex/test also map to http://192.168.14.30/browse.aspx?path=/design/imex/test but as a aspx file is not specified IIS tries to redirect to http://192.168.14.30/clients/design/...t/default.aspx and I get a 404 error. Is there any way of getting around this?

DJ