For more information, see Work with Product Keys and Activation. This key is not used to activate Windows. The product key in the product ID file is only used to install Windows. You can reuse the product key in the product ID file for multiple installations. If you use an EI.cfg file to differentiate volume license media, but you do not include a PID.txt file, the user receives a prompt for a product key to continue Windows Setup. You can use these files to automate the product-key entry page in Windows Setup instead of using an answer file. Product ID (PID.txt) lets you specify a product key.Edition configuration (IE.cfg) lets you specify values for edition ID, the channel, and the volume license.You can optionally use Edition configuration (EI.cfg) and Product ID (PID.txt) files to specify the Windows product key and the Windows edition during Windows installation:
Windows Setup Edition Configuration and Product ID Files (EI.cfg and PID.txt)
