LaunchBox has built in methods to filter out hack, bootlegs and clones all you have to do is check the appropriate checkboxes on the MAME form of the import wizard. Also if you have CHD files in with your ROMs don't import the folder instead go into File Explorer just hit sort by type and highlight all the .zips (or whatever compression your files are using) and drag them over into LaunchBox and that will open the import wizard go through the wizard and if you don't see the MAME specific form then abort because something is wrong with your platform association and it doesn't realize you are tying to use MAME. It works great I have the full ROM set and it only returns about 3K games out of the many thousand of games in the folder