Using Wubi to install Ubuntu Studio with pre downloaded image

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http://askubuntu.com – I am running Windows 8 x64 Enterprise, and have downloaded the Ubuntu Studio 12.10 x64 ISO. I place wubi.exe and the ISO in the same folder, and run it as administrator. But Wubi still attempts to download the stock 12.10 ISO. The Studio ISO also has a wubi.exe on it, but even that one tries to download the stock image. Is there a way to get this to work? Or does wubi support only stock Ubuntu? (HowTos)