We will now create an ISO image with our custom ei.cfg file. First you will obviously need an official Windows 8 ISO image. To assign a drive letter to it, right-click on the Windows ISO file.
Copy the contents of the Windows 8 ISO image to a folder on your hard drive, we chose the directory D:\Windows8ISO. Open up Notepad and use one of the examples we have for the contents of ei.cfg (we used the last one). Save the file as 'ei.cfg' in the folder 'sources'. Notepad automatically adds the extension .txt, so make sure you have selected 'All files' prior to saving.