When you open the Launcher for the first time, it will ask you create new database.
In the first Launcher run:
On NesCartDB generating:
If you enabled the option Generate entries from NesCartDB, the Launcher will start the generate process. This may take few minutes depending on pc speed and NesCartDB size. When done, the Launcher will be opened with all NesCartDB games listed. This is useful to fill the table with all available game information from NesCartDB such as game Developer, game Publisher ...etc.
If you choose not to generate the NesCartDB entries, the Launcher will be opened immediately with empty list. You'll need to add or assign files later to use the Launcher.
For the first time, after generating the NesCartDB entries, you'll notice these entries marked as X in front of each entry (game). That means this game is not ready to be played yet because of there is no file assigned to it yet. The next step: Adding And Assigning Files