tested it with snes files & it worked?!
executable C:\attract\EMU\RetroArch\retroarch.exe
args -L C:\attract\EMU\RetroArch\cores\snes9x_libretro.dll "[romfilename]"
rompath C:\attract\EMU\RetroArch\ROMS
try to generate your collection/romlist again
try starting attract-console.exe > press TAB key > General > Window Mode : Windows > resize AM window > start game and see what console says