I have gotten Retroarch to emulate quite a few of my systems perfectly, but Sega CD has me stumped. It keeps saying 'Retroarch requires "bios_CD_E.bin for Sega CD but could not find it in your system_directory: “default” ’ The bios is in the .rom folder with the cd .bins… but I have tried copying it to the retroarch directory and the System folder with no joy. Further, if I go into retroarch.cfg and enter a destination for "default in the system_directory= “default” , then retroarch tries to open Expresszip, then times out with "There was an error waiting for the window "Retroarch_ahk_class Retroarch). Quite confused. No clue why ExpressZip is even involved – nothing is zip’d. Any help?
Nevermind. After 3 hours I found it. Rocketlauncher was pointed to the .7z file instead of the .exe. My bad…