[accidentally listed my dos games as "broken" deleted platform, how to undo this for re-import]

is there anyway to undo the broken games list? is it stored locally some where? i accidentally marked my MS-DOS games as broken trying to figure out dosbox, and then deleted them for a re-import but now it doesnt see any of them as importable games, not a single one can i import, even manually

is there a way to fix this does anyone know?

any and all help is greatly appreciated : )