How to reach it
Go to Settings and click the M.A.M.E. Configuration button.
How it works
M.A.M.E. uses its own internal database of games where each game has a unique identifier. In order to support M.A.M.E. Metropolis Launcher reads M.A.M.E.'s internal database and imports these games.
For this we need:
Important: before clicking the Scan! button, you should make sure that the mame.ini is present in the M.A.M.E. installation directory and at least the rompath is set up correctly. Metropolis Launcher will only add working games/Roms.
After scanning, you can import even more meta-data by using the Import Category File button.
For each found category Metropolis Launcher tries to apply meta data attributes (e.g. for the category "2P alt" the attribute "1-2 players" and "hot seat" are suitable). If no meta data attributes can be found, the Edit Game dialog in Category Mode will pop up for you to decide which attributes should apply for the category.
If you untick the Auto-Import checkbox, for every category the Edit Game dialog is shown.