To create a custom report in Crystal Reports for Blackbaud, the export format must be Microsoft Access Report Writer database (Raiser's Edge 6, Registrar's Office and Admission's Office) or Blackbaud Report Writer Database (Raiser's Edge 7).
The Education Edge does not allow for exports created using the Excel format to be used as an option in Custom reports (reports module). You would need to run the report directly through Crystal in order to see results.
Excel exports only allow for a limited amount of information to be exported. Excel exports not only prompt for the number of values to export (for example number of grades to export for a student record), but also limits the number of rows exported to around 65k. You then run the risk of having missing data because Excel can't handle your export.