^I don't think that it's possible to split an iso like that.
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In theory, I think that if you were to extract the iso to a new partition and boot from it, you could boot into the Windows 7 installer. You'd probably need to create an NTFS partition beforehand so that Windows would have a partition to install to. After installation, you'd need to delete the partition that contained the iso files and expand the Windows partition.
However, as with many things, what seems good in theory will be riddled with intricacies and possible errors everywhere down the line. This is, however, a risk you run when using "legal" methods to obtain files.
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