Warning: This will create much larger files. You will need the matching .cue sheet. You can generate a .cue automatically using a tool like CUE Maker or extract it specifically using chdman extractcd (different command).
If you are committed to the ePSXe architecture via RetroArch, or want to convert your library anyway for future-proofing, follow the steps below. How to Convert PS1 Games to CHD epsxe chd files
CHD is a lossless compression format originally developed for the MAME project. It has become the preferred format for CD-based gaming because it: Warning: This will create much larger files
Save this in your ePSXe folder:
Here is where things get tricky. If you download a .chd file and try to run it via File > Run ISO , ePSXe will look at the file extension, scratch its head, and return a "No disc loaded" error. If you are committed to the ePSXe architecture
Make sure you are running or newer for best results. Happy emulation!