Sorry if this is too off on the entire board, but my head's boling. The newly released Microsoft "media creation tool "for a relative new win81u1 iso produces different isos per creation!
Just try it. Create two folders, make two 81core-64-noN isos into them, mount them as virtual discs with win81 and check sha1s or bit-for-bit compare them. Files boot.wim and install.esd are different! Now how is this possible? This cannot be meant seriously or is it really?