Stop it from autoselecting a core?

I selected a game from my NES playlist with BNES, and wanted to play it on Nestopia afterwards, but from that point on it auto launched BNES when that game was selected. Even after deleting the core, it still tried to, it just exited Retroarch.

The easiest solution is probably to delete the playlist and re-scan.

I ended up doing that, but it took a while because I have around 2,700 NES roms. I guess I could always keep a copy of the playlist somewhere and overwrite in the Retroarch location whenever I want a new core on a certain game.

I think you can select another core from Load content -> Select file and detect core.