Hi,

I have a file with 4 lines and 2 polylines, the shape is closed. But impossible to do an extrusion, see below the DraftSight answer :

: EXTRUDE

Specify entities to extrude» ALL

6 found

1 was not in drawing area.

Specify entities to extrude»

Unable to extrude the selected entity.

I have the same problem with this file on other software because I would need to explain to this software to connect these 4 lines and 2 polylines together.

In attachment, you have a picture of the DraftSifght screen and the dxf file in question.