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figured out how to copy the post I'm going to post this answer in a few different areas on the forum. I have been trying to figure out how to launch retroarch mame for the systems that don't have a stand alone core. I have finally found a mostly elegant solution 1) Add a New Emulator - I have named mine RetroArch MAME console cores Add your retroarch.exe Make sure to check "Don't use quotes..." 2) Tab over to the Associated Platforms Here's the magic sauce example 1 "neocdz -cdrm \"%romfile%\"" example 2 "a5200 -rp \"F:\Roms\Atari 5200\" -cart \"%romfile%\"" example 3 "coleco -rp F:\Roms\ColecoVision\ -cart \"%romfile%\"" The reason for the "Don't use quotes" and adding this as a new emulator is because of the special thing we have to do to the command line using mostly the same arguments has standalone mame/mess you have to have all the arguments in double quotes " but because of how Windows handles long file names with spaces the locations have to be in quotes to. This throws retroarch/the windows commandline off. This is where the \ before the double quote at the beginning and the \ before the closing double quote per directory/location. Also we can use the launchbox variable %romfile% to help make this work. 3) On top of all that you also have to specify the rompath if the mame core hasn't generated an ini with the rompath. This is needed for the bios of the core you are loading. If all your mame console bios files are in the same dir you could just use that for each entry The core will generate ini files for each system after first run. 4) I also edited my retroarch core options file. I probably enable boot to bios but I don't at the moment. There is my setup for launching roms through retroarch mame. I hope this helps