Because of licensing issues like the above: I've a lighter version of the program like this (also based on Windows 10 PE) - called "MiniNT" (https://github.com/VulpesSARL/MiniNT5-Tools), and is fully open source, including the scripts to build the ISO (and other images) from scratch. Is supported in both 32 and 64 Bit editions. The 64 bit edition also can execute 32 Bit executables. It also can boot from USB, CD-ROM as well PXE Network.