Using image offline is done with DISM (Deployment Image Servicing and Management), a native Windows tool.
When changes are specified (saved or saved) in the image, the modified install.wim file can be used to deploy Windows or replace the original install.wim file on the existing installation media. However, it is only a modification of the default Windows installation image, the install.wim file, and the procedure is simple. Using the offline image, mounting the image, confirming the changes seems a bit complicated for the average Windows user.
