StarOffice Presentation.
Presentation originally created by StarImpress, a slide show program included in the StarOffice suite; saves a collection of slides, often incorporating a title slide followed by supporting slides. SDD files were used by StarImpress through version 5. StarImpress version 6 adopted the .SXI format, but now Open Office (StarOffice's successor) and OpenOffice.org both use .ODP files for presentations.
The SDD file extension is used by OpenOffice.org for presenations.
The SDD file extension is used by BPM Studio.
Data file used by Smart Diary Suite.