What is .FCS file?
Save state created by FCEUX, an NES, Famicom, and Famicom Disk System emulator; stores the complete state of a game at a point in time.
FCS files along with other FCEUX files are located in the ~/.fceux directory.
FCEUX is an advanced version of the FCE Ultra emulator. It is designed to provide functions from different FCE Ultra branches, such as FCEU rerecording, FCEUXD, and FCEUXDSP.
Recommended Software Programs to open .FCS file