Right Click On Ini File And Select Open Or Open With And Choose Notepad Or Word Pad. Its Same For All Hitman Games.
First you right click on the file, then choose Properties, then check that file isn't marked "Read Only" <-- Disable that
I know, you aren't a PC guru and I'm not stupid...I know how to it but after I change the file, I get an error when trying to save the notepad file...
Then you should do what White-Angel posed 2 posts above.