This will extract the game's disc image files, which will likely be a .cue sheet and one or more .bin files.
Several tools are available for converting ZIP files to CHD, but the most commonly used is , a part of the MAME distribution. chdman is a command-line tool that can convert between various image formats, including ZIP. Convert Zip To Chd
The official tool for creating CHD files is , a command-line utility bundled with MAME. Because command-line interfaces can be intimidating, developers have created simple batch files and graphical interfaces to automate the process. This will extract the game's disc image files,