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Hmph. Just when I'd given up I found it. 

Someone has managed to open it but apparently it's 'pretty broken' so 

"A test release of ultimate racer 4.0 layout editor is available to courageous testers" seems a fair assessment!

I usually like to jump in on things like this but since I haven't even got to grips with V3 yet I'll leave this to more experienced users to tackle!