Currently the file types you can upload for wikis that have enabled uploads are:
- png – POrtable Network Graphics
- gif – Graphic Interchange Format
- jpg and jpeg – Joint Photographic Experts Group graphics
- ppt – Powerpoint/Impress/Keynote
- pdf – Portable Document Format
- doc – Word/Pages/Write
- xls – Excel/Calc
- zip – PKZipped compressed files
