Maybe it was John Walkenbach's AddPath addin???
http://j-walk.com/ss/excel/files/addpath.htm

Rick wrote:

Several years ago, I had a free tool that I used in Excel. It resulted
in the path to the file being PRINTED at the very top of the
spreadsheet but didn't interfere with any cell function. Nor did it
appear on the screen while working in the spreadsheet. It was a print
only tool. Do any of you remember such an animal??? I wish I had it
back now. I SHOULD have kept it when I upgarded my hardware but
hindsight is twenty-twenty.

--

Dave Peterson