If you provide the (software name, industry, or sample hex header), a more precise conversion path can be recommended.
Open your .dw2 file in DesignCAD and go to File > Save As , then select "AutoCAD DWG" as the file type.
: The most reliable way to convert a .dw2 file is to open it in a current version of DesignCAD and use the Save As or Export function to select the .dwg format.
