This folder contains electrical CAD designs. You'd need kicad version 5 or higher
.pro
files are kicad files (ask Dilawar).
This folder contains 3D cad designs for 3d printing etc. You'd need
freecad
or openscad
to view the designs.
.stl
, .scad
can be viewed/edited on FreeCAD or openSCAD (ask Anzal KS).