打开文本文件的按钮将无法使用不在类根目录中的文本文件

I have this button which is meant to open a text file for easy tweaking. It works fine when I put the text file in the same directory, but when I try to put it in a subsidiary directory and change the path to "config/gameItems.txt" it doesn't do anything, not even tell me it can't find the file. Any thoughts?I have this button which is meant to open a tex