Which file should I choose?
Use SXWHIRDLG10001_2D-front.dxf (revision 1) to insert the supplied editable drawing into your layout.
Use SXWHIRDLG10001_3D-simplified.stp (revision 1) to place the original solid geometry in your 3D assembly. The ZIP contains the unmodified SXWHIRDLG10001_3D-simplified.stp.
