In Windows, check under 'Folder Options' to make sure you can view hidden files.
Ex: In XP, it's "Tools/Folder Options/View" and make sure "Show Hidden Files and Folders" is checked.
You may also want to click the "Apply To All Folders" button. That way you'll always see the hidden files.
And, for safety's sake, you don't want to always see these files (in case a child or spouse may accidentally delete them), once you're done editing the ini file, go back and click the "Do Not Show Hidden Files And Folders".
Hope this does it!