What Program Do I need fo these files?

[ComputerWizKid]

It a model file from something just don't know what thanks

 

[notfred]

It's from autocad.

 

[ComputerWizKid]

Is there a viewer for it? so I don't have to buy the program? you know like how adobe puts out a pdf reader but you have to pay to make them?

 

[MrChad]

http://www.infograph.com/products/dwgviewer/

first result in Google