1. Open the drawing with AuToCAD software and save it as a file. Dxf format, and then close CAD. Note: it must be closed!
2. Reopen AuToCAD software, and then open the file in. You just saved dxf format, saved it as. dwg format (restored to CAD file), and then printed it out and removed it!
3. If AuToCAD software opens the file in. Dxf format just now, and the command prompt is invalid. I suggest you open it with the high version of AuToCAD software and save it to the low version (generally save it to 20 14 version).