https://forums.autodesk.com/t5/autocad-forum/dwg-file-association/m-p/5690148#M323985 Try a repair on AutoCAD 2016 see if that works. You will need to open a drawing firstly of course in 2016 to reassociate. Open AutoCAD 2016 and hopefully it rewrites the registry settings to open the last know product used for DWG format.<BR /><BR />You could also look at turning Automatic Association back on in the registry... To Turn on automatic association in ACAD there is a registry key called DwgAlwaysAssociate in HKEY_CURRENT_USER\Software\Autodesk\AutoCAD\R20.1\ACAD-F001:409\Profiles\&amp;lt;&lt;UNNAMED profile=""&gt;&amp;gt;\General\ set it to 1.<BR /><BR />Also take a look at this useful link which explains what you can do in the registry... <A href="https://designandmotion.net/autodesk/mfg-pages/inventor/autodesk-dwg-launcher-wigged-out-fix/" target="_blank">https://designandmotion.net/autodesk/mfg-pages/inventor/autodesk-dwg-launcher-wigged-out-fix/</A><BR /><BR />You could always just set the dWG format to the AutoCAD 2016 acad.exe rather than DWG LAuncher.<BR />If my post was helpful to you, please could you give "Kudos" and/or mark the "Accept as Solution" button(s) below. Thanks in Advance!&lt;/UNNAMED&gt; Tue, 23 Jun 2015 19:49:53 GMT ukdxb012 2015-06-23T19:49:53Z