In order to capture all eFUSE programming settings in one file, and so make it easier to export eFUSE settings to other eFUSE programmer implementations, as well as to mass-program the same eFUSE settings into many devices, Xilinx has defined a file format called NKZ, designated by the file extension .nkz. The NKZ format is a superset of the existing NKY format; that is, NKZ supports all NKY fields as well as any programmable eFUSE register settings.