Launch, select your MAME Rom folder, and enjoy your newly generated playlist.
Why would I use this over RetroArch Playlist Buddy ?
This application is written in Java. That means you can run it on a desktop Linux, or a Raspberry Pi. Plus it’s pretty fast (can process 11 322 roms in less than a second), and simpler than RetroArch Playlist Buddy.
Can I use it for other platform such as Atari 2600, or Nintendo 64 ? No, and you don’t need to, as the Scan function of retroarch works well for those platforms.
Will it generate thumbnails ? No. Use retroarch playlist buddy for that.