Rename the file to convert.bat and double-click it. It will find every disc image in the folder and convert it to CHD automatically. Frequently Asked Questions Can I convert CHD back to ZIP/ISO?

A: It is recommended to keep the original ZIP file until you have verified that the CHD file works in your emulator. Once confirmed, you can delete the original files to save space.

5.2 ROM sets comprised of multiple binary files (cartridge/arcade ROMs)