oscdimg

Oscdimg is a command-line tool that you can use to create an image (.iso) file of a customized 32-bit or 64-bit version of Windows Preinstallation Environment (Windows PE). You can then burn the .iso file to a CD or DVD. Oscdimg supports ISO 9660, Joliet, and Universal Disk Format (UDF) file systems.

Extracted from the Windows Assessment and Deployment Kit (ADK)