Unfortunately, there are no known emulators available for the Capcom Play System 3 (CPS-3) on Windows, Mac, or Linux. This is due to the fact that the CPS-3 hardware is difficult to emulate, and has only recently been partially emulated.
However, there are some arcade boards available that can be used to play CPS-3 games on original arcade hardware. Additionally, some CPS-3 games have been ported to other systems, such as the Dreamcast and PlayStation 2, which may provide an alternative way to play these games.
Overall, if you’re looking to play CPS-3 games, the best option is likely to seek out original arcade hardware or one of the ported versions of the games.