I got DosBox pure running fine within Retroarch, so I decided to add the ROMs to my Launchbox. I never used DOS games with Launchbox, so I started fresh. I added them as ROMs, used Retroarch as the Emulator with the DosBox pure core.
My issue comes trying to play a game, while the file name is the correct .Zip file by the time Retroarch loads its doesn't load the correct file. But if I work directly in Retroarch and choose the same game file, it loads fine.