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In a Windows 7 DVD I see two big files: boot.wim and install.wim. My assumption is that I can modify boot.wim to affect the Windows Preinstallation Environment itself. Is this assumption correct?

To put it another way... Instead of providing a driver disk; Can I inject, using DISM, into boot.wim, using dism /add-driver ? Is this enough to enable support for a unsupported hard disk controller within the installation environment itself?

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Yes, it is. You're also going to want to add it to install.wim as well, so that it gets installed, otherwise your system likely won't boot after.

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