For versions of The Raiser's Edge 7.92 and lower:

Open the file in Excel and rename the headers from Excel.

OR

  1. Create an import file and select the fields to export.  The import file fields are closer to the original field names than the export headers.   
  2. Rename the .imp file to a .csv file and open within Excel
For versions of The Raiser's Edge 7.93 and higher:

This functionality is available for file formats exported in columns such as Excel and Comma Separated Values. 
  1. Highlight the field in the output list.
  2. Right-click on the field and choose Column Heading.
  3. Enter the new Column Heading
  4. Click OK.