Autodesk – DWG Launcher wigged out fix

7/8/2009

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This has been a pain in numerous people’s sides for a long time.  One day you love it and the next day you hate it. 

The DWG Launcher

This gizmo is the thing that loads the drawings from remote requests, based on the registered DWG extension. AcLauncher.exe

Since Autodesk is trying to spread it’s trademarked use of DWG to numerous platforms, it needs some flexible way to allow users to open the DWG easily through explorer and other applications. 

How this works

When the OS sees a DWG file request sent, it uses the DWG registered app to open it with. In this case it is the DWG Launcher. The application uses registry entries to figure out which version of what application to use.  It is fairly simple, except there is nothing evident about it, and it gets fouled up. 

The registry settings governing this work something like a flow chart:

1. Windows initiates default dwg app ->DWG Launcher
2. Launcher reads shell DWG default Application –> AutoCAD
3. Launcher goes to AutoCAD and reads launch instruction –> AutoCAD r18 exe path
4. Launcher executes launch statement with requested dwg file

Most users will never have a problem with this since they only use 1 type of DWG application.  Actually, most users of differing DWG apps never have a problem.