The PD file extension is also sometimes used for special image format used in medicine. Male Normal CT image format.
Large image design created by FlexiSIGN 5, a sign creation program; typically stores a graphic design in a vector graphic format so that the image can be resized without losing quality; may also store raster graphics and text. PD files are used for storing signs and banners that can be printed on plotters and cutters.
File used by Spore, a creature evolution and survival game; stored within Spore audio .PACKAGE files and specifies audio settings for playing and looping background music; saved in a plain text format.