AutoSketch
From Just Solve the File Format Problem
AutoSketch is a discontinued (2016) 2D vector graphics and CAD program from Autodesk.
It has native .skd and .skf file formats. Both are proprietary binary formats. .skt is also used as a template extension.
Identification
.skd files are generated by DOS versions 1-3 and Windows version 2.x of AutoSketch and begin with ASCII "AutoSketch drawing database".
.skf files are generated by Windows versions 5-10 of AutoSketch and begin with the Hex Values 0A000000000B0334 then two bytes indicating version.