Can Wubi use the ISO I already have?

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http://askubuntu.com – I was reading the Windows Installer for Ubuntu desktop instructions. They that an ISO image for Ubuntu is downloaded during the installation process. But what if I already have an ISO image for Ubuntu. Can I make the Windows Installer use that, so it doesn't have to download an ISO image again? 12.04 LTS and 12.10 are the versions of Ubuntu I'm interested in installing, in case that matters. (HowTos)