DWG
From Just Solve the File Format Problem
				
								
				
				
																
				
				
								
				Overview
DWG is the native binary file format for AutoDesk CAD products (AutoCAD, etc.)
Resources
- Wikipedia page on DWG
 - Open Design Alliance's specification on DWG here
 - LibreDWG, GNU source code to read/write DWG files
 - Sample files directly from AutoDesk