When a DWG is renamed to anything other than DWG, it cannot be opened.When attempting to open file error message received that file is not arecognized file format.To reproduce:1. Select DWG file in either Open File Dialog in V8i or WindowsExplorer2. Rename extension from .dwg to .dgn3. Attempt to open file in MicroStationProduct: MicroStation V8iVersion: 08.11.07.171Area: DWG, Problem ID#: 43501, ERRORMESSAGE
RealDWG work as design issue since AutoCAD cannot open any non-dwg (ordxf) file extension.