EXE's are usually needed when the game you have is on a different platform that the one the trainer was made for and a new version of the trainer needs to be made. A Game save and it's location would be better if your game is the one from STEAM.
Here is my save file from location "C:\Users\....\AppData\Local\FF4A"
I cannot load your savegame, its locked to your account. Question: Do you have at least TWO items of the kind you were trying the cheat with?
Seem you are correct. We need at least 2 items to make it works. Thanks a lot.