The DST file extension is usually associated with the computer-aided design software AutoCAD and Tajima CAM files, used by embroidery pattern software such as Orchida Soft.

AutoCAD helps users create technical drawings in 2D and 3D. The DST file contains information regarding groups of linked drawings, called a sheet set. A Tajima DST file contains instructions that tell the embroidery machine how to stitch a particular pattern. File extensions are usually the last three characters after the final dot in a file name. The extension tells an operating systems, such as Windows, the correct program to use to open the file.