I reviewed the allowed file types and added *.xls, *.xlsx (old and newer Excel formats), and *.ods (Open Office Spreadsheet)
Be careful downloading macro-enabled spreadsheets because of the risk of viruses in the macros. Keep your antivirus programs up-to-date.
Current allowed file types
- Picture formats: gif, jpg, mpg, png
- Audio/Video upload types: mpg, mp3, avi
- Spreadsheets: xls, xlsx, ods
- Documents: pdf, txt
If anyone wants additional file types added, let me know.