My MAME version is 0.163b for Windows 64-bit. I have DDR the first version (GN845 VER. AAA to be specific) and DDR Extreme. I just can't seem to get any of them to play. DDR1 says it is overall working and DDr Extreme says it is NOT working. I got the required parent files, yet I keep getting the same message that one or more required ROMs/CHD are missing. Can someone tell me what I'm doing wrong or how you got it working?