opening Autocad LT .dwg and .dxf files

I am a brand new user of DraftSight having downloaded the latest version today. My first attempt was to open an Autocad LT .dxf file but the format was not recognised by Draftsight. I then tried opening the Autocad LT .dwg file and that was not recognised either. I also tried importing the files and inserting them with no success.

The need to open files created on other systems is a big part of being able to meet the Customers needs and it was my understanding that .dxf files could be opened by most systems.

Any help would be appreciated.

Regards,

Stuart