Appendix A: File formats recommendations

Please consult the list of recommended file formats of the Library of Congress. If in doubt, get in touch with the Eawag Research Data Management Project <>.

Some hints

  • Microsoft Word (.doc, .docx) and Microsoft Powerpoint (ppt, pptx)

    Save as PDF/A.

  • Microsoft Excel (.xls, .xlsx)

    Export to CSV.

    If you use Excel for data entry and storage, and follow the advice in the excellent guide Data organization in spreadsheets, export to CSV will pose no problems. Consider using xlstocsv for doing that reliably and comfortably.

    If you rely on Excel for data organization, annotation, visualization, analysis or if you use macros or any advanced features, it is likely not possible to export to a format suited for sharing and preservation. In this case, save as xlsx (not xls) and hope for the best.