Comment by userbinator

Given that https://en.wikipedia.org/wiki/BartPE exists and can also create a "portable Windows" from the original files of an installation media for a normal version of Windows, is it possible to manually create one's own WinPE in the same way? i.e. is WinPE composed of only the same files that can be found on the installation disc, arranged in the right structure, or is there something more to it?