The install.wim (Windows Imaging Format) file is the heart of the Windows 10 installation media. It is a compressed, single-file disk image that contains all the system files, drivers, default settings, and editions (Home, Pro, Education, etc.) necessary to deploy Windows 10 to a new machine.
dism /Apply-Image /ImageFile:"D:\sources\install.wim" /Index:2 /ApplyDir:"E:\" This is exactly what Windows Setup does behind the scenes. FAT32 has a 4 GB file size limit, but install.wim often exceeds this. Split it: install.wim download windows 10
Introduction: What is install.wim?
dism /Unmount-Image /MountDir:"C:\mount" /Commit To deploy Windows to a target drive (e.g., E: ): The install