To have content-less cores on the list like this:
Create a play-list in this format:
MrBoom.lpl
.\cores\mrboom_libretro.dll
Mr.Boom
.\cores\mrboom_libretro.dll
DETECT
DETECT
MrBoom.lpl
2048.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