Overwrite pre-existing data in INI?

Using INI++ 1.5 to save option data in my game. I have the following setup in the INI itself.

[options]
fullscreen=0
screenscale=2
soundvol=100
musicvol=100

It loads data from the INI just fine. It's WRITING to the INI that I seem to be having trouble with.

Example: Let's say you set the screen scale to 2x (which would be a value of 1 saved to the INI).

Start of Frame:

• Appdrive$ + Appdir$ + "options.ini" (Load file, keeping the old path, keeping the data in the current object.)

Player Pressed Button (Okay):

• Set Item "fullscreen" in group "options" to value FScreen("Active")
• Save INI

For some reason, the value for fullscreen stays the same. Nothing changes.

EDIT: When looking in the debugger, the data is changed there. But just not saved. And for the life of me I have no idea why.

Found the issue. In order to save the data, I have to set the default INI file to the extension in the frame. Otherwise, it loads the data, but not the file to edit.