.NES File Extension

An NES file is a game ROM created from an NES (Nintendo Entertainment System) video game. It contains the same data as the original NES cartridge and can be opened and played on a Mac or PC using an NES emulator.

Some NES emulators play certain ROM files better than others. If you notice a game's audio or video performance is choppy in one emulator, you may want to try another emulation program.