To have content-less cores on the list like this:
Create a play-list in this format:
.\cores\mrboom_libretro.dll Mr.Boom .\cores\mrboom_libretro.dll DETECT DETECT MrBoom.lpl
.\cores\2048_libretro.dll 2048 .\cores\2048_libretro.dll DETECT DETECT 2048.lpl
Basically this makes the content to be loaded the core.
Notice the backward slashes, that is because of windows is used in the example.
It is important that the playlist needs to be coded in UTF8-without BOM