Hey guys, I didn’t see this documented anywhere so I just wanted to share.
The RocketLauncher module for RetroArch isn’t setup to handle Commodore 64 by default.
You can fix this by adding the line: Commodore 64|LibRetro_VICE|vice_x64_libretro
inside the retroarch.ahk file in your modules.
Once you do that it launches just fine. (Now just to figure out the controls XD)