ROM scanning and playlist generation
Lakka uses a ROM scanning system to generate the playlists in its horizontal menu. It is a convenient way to sort your ROMs on a per-system basis.
Each ROM stored in a folder being scanned by RetroArch is checked against a database.
This database is based on No-Intro and will recognize only the good dumps. See it as a sort of ROM validator.
If you would like to generate playlists manually, or generate playlists for systems that do not have scanning support yet, the playlist file format has been documented.
Нифига не понял, но очень интересно