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You will need to navigate to where you saved the 95-2003 Excel workbook. Once you've selected a viable worksheet, a dialogue box will open asking you to verify the data. This is also where you will be telling the Workbench import wizard if you are using column headers. You should have headers on your data. If you don't, close out of the process and go back and add them. Look over the data in the dialogue box and make sure it is as you expect, then hit OK. The box that appears is the Mapping Editor. 
