Ok from RA I can load games. I tried Atari 2600 and even Neo Geo Pocket and they seem to work. I just cant get them to launch from Launchbox or Bigbox. But I also tried some others like WonderSwan, Fairchild, and Atari 7800 and those do work in LB. Systems like Nintendo, Atari 2600, Neo Geo Pocket, Atari Lynx all dont.
As for the -c Command line it was exactly the same except on my system in the Config folder the file was "mednafen_ngp_libretro.dll.cfg" and not "mednafen_ngp_libretro.cfg" like in the video. So the total line I tried was [ -L "cores\mednafen_ngp_libretro.dll" -c "config\mednafen_ngp_libretro.dll.cfg" ].
After it bricked I tried going back to the just the original that worked [ -L "cores\mednafen_ngp_libretro.dll" ] but nothing its still dead. I cant figure out how to remove the shader from retroarch.