.GCT File

File extension gct is likely mainly related to the Ocarina Cheat Code Manager, a program used to generate cheat files Nintendo Wii video games.

Wii cheats are distributed as simple txt files and Ocarina exports them to .gct files.

Files with gct suffix can be often found as cheat generated using the Ocarina Cheat Code Manager.

How to open:

By all accounts, .gct files are used only for internal purposes of Ocarina Manager and Nintendo Wii.

How to convert:

It seems that .gct files cannot be imported back to txt file. It can only be imported to Nintendo Wii via Wii SD card.