I have successfully been able to get MAME,NES,SNES,ATARI 2600 working on Lunchbox 13.7
I imported my Sega Genesis roms the same way by moving them into the Games/Sega genesis folder inside of Launchbox. Launchbox automatically found them and imported the artwork. When I try to start any SG game I get an error message that reads. "7-Zip returned an error when trying to extract the archive."
I went to tools/emulators and it is set to use Retroarch. What am I doing wrong? Thank you!