Comment 3 for bug 176605

Unfortunately the systems we reported on are no longer available for testing. I could build another on which to test but would not be able to get there for at least another week due to other commitments. The one further clue I can offer is an extract from an email from Marvin back on 12/12.
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from Marvin on 12/12/07
I had looked at the boot.ini file earlier, and felt that it was working okay. Indeed the boot.ini file contains the directions you said it would:

        "[boot loader]
        timeout=15
        default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS
        [operating systems]
        multi(0)disk(0)rdisk(0)partition(1)\WINDOWS="Microsoft Windows XP Professional" /fastdetect /NoExecute=OptOut
        c:\wubildr.mbr="Ubuntu""

But, on the first start I had indicated the install should be to drive F: and I did the same on the second try. So, in both cases the install should have been to the same location. Now, the boot.ini file indicates the .mbr file is in C:\. I would expect that, no matter what the actual install partition. The Wubi loader would still be on drive c:\ I doubt that this code tells the Wubi installer where to install Ubuntu. I suspect it tells the system where the bootloader is. But I could be all wrong about this.
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So the real question may come down to how would any part of wubi (such as C:\wubildr.mbr) know that the windows file with the installed ubuntu was on drive F:. Again, Marvin did this with the 7.04 Beta of the wubi installer for ubuntu. I know that is not what you currently want info on, but it is what I have for now and perhaps is indicative for the later version as well.

I will check back here before building a new environment to test this [hopefully] next week. Sorry I can't do better sooner.