Remove double lines in .dxf

Hello,

i have a problem and hope to find help here.

When i want to create a Laser-Plate with a Stencil-Font, then all lines appear double. Then there are 2 lines one above the other.
The problem is, i have to remove the second line for the laser-cutter that read the .dxf-files.

Is there any way to remove the redundant lines easy ? Or have i to remove it line for line ?

 

Thanks for help and sorry for my bad englisch =D

 

Greetings

 

P.S I'm Using Draftsight 2015 x64.