How to input the image?

[Theforgot3n1]

So I had made a AddUseItemOn and when you would use the item on the door u should get a note.
however you get a note but It didn't want to load the background for the note.
I used
AddNote("StephanoHelpDungeons2", "bg_letterstephano");
the image is a tga file.
It didn't work either if I changed it to: AddNote("StephanoHelpDungeons2", "bg_letterstephano.tga");
Any tips or help?

Why ".tga" on only one of them? Just wondering.