Help: Excel file referencing!!

I have an Excel spreadsheet that used to pull data from another file (B). I've deleted all the references to file (B) in my spreadsheets, but when I try to open this file, a file opening dialog box pops up and ask me to locate File (B).

I searched up and down, left and right but just can't find any reference to (B). Is there any other way to find a "missing link" embedded in the sheets?

BTW, I'm using Office 2000.