Hello Chung and welcome to Advanced Installer forums,
Please bare in mind that when adding a .INI file to your package, you have two options. One of them is to import the file as a
regular file and the other one is to import it in Windows Installer format. In order to use the Advanced Installer INI editor, you have to import the file in Windows Installer format.
Now, in order to modify an INI file's entries or sections, you can follow our
"Edit INI File Dialog" tutorial.
Another way to do this is to use the "New Text File Update" option. In order to do this, go to "Files and Folders" page in the left pane, select your INI file and press on the "New Text File Update" button. After that, go to "Replace" tab and configure it as you wish.
Best regards,
Catalin