Multiple CDs of the same game can be loaded simultaneously from EmulationStation into RetroArch by creating a .M3U playlist file (plain text .TXT with a .M3U extension).
An .M3U playlist can be used with any game extension:
.BIN / .IMG / .CCD / .SUB,.BIN / .GDI / .RAW,.CHD,.CDI,There is some examples below. This applies to all systems with multiple discs / cartridges / floppy discs per game and supports the .M3U file extension.
.BIN / .CUE format.CHD format.BIN / .IMG / .CCD / .SUB format.BIN / .GDI / .RAW format.CDI formatFinal Fantasy VII (France).m3u which contains the following information:Final Fantasy VII (France) (Disc 1).cue
Final Fantasy VII (France) (Disc 2).cue
Final Fantasy VII (France) (Disc 3).cue
Final Fantasy VII (France).m3u which contains the following information:Final Fantasy VII (France) (Disc 1).chd
Final Fantasy VII (France) (Disc 2).chd
Final Fantasy VII (France) (Disc 3).chd
Final Fantasy VII (France).m3u which contains the following information:Final Fantasy VII (France) (Disc 1).ccd
Final Fantasy VII (France) (Disc 2).ccd
Final Fantasy VII (France) (Disc 3).ccd
Final Fantasy VII (France).m3u which contains the following information:Final Fantasy VII (France) (Disc 1).gdi
Final Fantasy VII (France) (Disc 2).gdi
Final Fantasy VII (France) (Disc 3).gdi
Grandia II (USA)[Zorlon].m3u which contains the following information:Grandia II (USA)(CD 1 of 3)[Zorlon].cdi
Grandia II (USA)(CD 2 of 3)[Zorlon].cdi
Grandia II (USA)(CD 3 of 3)[Zorlon].cdi
If you need to change the disc while the game is running, you have to do the following:
HK + Left Joystick (Up direction)HK key + Left Joystick (Right or Left direction)HK key + Left Joystick (Up Direction)Depending on your operating system (most often Windows), you may see a rejection message like this:

In this case, open Notepad++ editor (install it before if you don't have it) and open your .M3U file. and in the menus go to Edit > Convert Line Breaks and choose Convert to UNIX Format (LF). Once done, save your file and it should be read correctly by Dolphin.