I am using an Excel 2007 extract (file size 58MB) with Tableau 7.0 . I tried to add data from a second Excel file to this extract (Data-->file name-->Extract-->Add Data from File). The second file has the exact same headers as the first file/extract. When the process was finished, I got the following dialog box, “0 rows successfully added”. None of the data from the Excel file was added to the extract. Any suggestions on how I could fix this or what could be going on?