Blogging using Windows Live Writer

Hi, I'm trying to configure Windows Live Writer Beta to post to my Elgg blog. I found this helpful article http://elgg.ou.nl/veg/weblog/564.html but where it refers to adding the path to /mod/rpc/RPC2.php I couldn't find this directory or file in my installation of Elgg 1.7.1.

Instead, I tried pointing Live Writer to the different xml-rpc.php files in the Elgg installation but that didn't work. I also tried but couldn't find an RPC plugin from the plugin repository.

Can someone tell me how Live Writer can use the xml-rpc function correctly in Elgg 1.7.1? Thank you.

P.S. Live Writer does support metweblog-based blogs, if that helps any.