In iTunes 11 it seems the main menu options along the top of the screen get "hidden" for some people. Press Ctrl B and the menu should appear. Then go to "file" and take it from there. I saw this in an answer someone kindly gave to another earlier question, and it worked for me!
Stu...I did get that window to open. Thank you. But when I click on "add file" the window that opens is full screen and I cannot make it smaller...there is no icon to make it smaller and I cannot drag the edges smaller. So I can't drag and drop the file into my iTunes...? Any suggestions?