This is a vector imaging format used in the CorelDRAW editor. It has a template that can be applied for other designs, including styles, grid parameters, page layout and other parameters. The CDT template allows for the creation of several images in one style without changing the settings in manual mode.
The SGI file type is primarily associated with Silicon Graphics by Silicon Graphics, Inc. This extension can be captured by a number of different programs to include: ACDSee (ACDSEE6.EXE), FotoCanvas (FOTOCANVAS2.EXE), Graphics Converter Pro (GRAPHICSCONVERTER.EXE), Image Editor Plus (ICPLUS.EXE), IrfanView, Paint Shop Pro (PSP.EXE or PAINT SHOP PRO.EXE), Picture Viewer (PICTUREVIEWER.EXE), Slow View (SLOWVIEW.EXE).