The exporter was never released iirc. It's a 3DS MAX plug-in (these are not standalone, you need 3DS MAX). I was having problems implementing skeletal (bone-based) animation, that's what was holding that up. Unfortunately I won't have time to sort this out in the near future at all, I'm just too busy... Wasn't a very good idea to go with a custom model file format anyways, should've stuck with .x files (which are easy to load and support skeletal animation anyways). Something for Razorblade 2...
Sorry!
Razorblade 3D doesn't support primitive rendering, it only works with models. You could just make a quad/plane mesh and bring it into the game, of course, but the exporter isn't released yet...