D:\Flash Programming Tool\WINDOWS64>FPTW64 -bios Z170I-PRO-GAMING-ASUS-0403.ROM
I copied the files you mentioned in the same folder that I have .ROM in but I still get the same message, I'm using Z170E.
I get the same error, the ftp command doesn't exist. I copied the files onto the same folder that my .rom files are located and I still get the message.