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CAD tip CAD tip # 2311:

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Q - question

How to to use double-click to open DWGs in a single AutoCAD session?

A - answer ... or vice versa - in multiple sessions?

Windows settings for the DWG file type define how are DWG opened when dbl-clicked. Open Windows Explorer and in Tools, Folder options, File types tab select DWG - AutoCAD Drawing. Click on Details, select AutoCAD open in the list and click the 'Modify...' button. Now check 'Use DDE' if you want to open DWGs in a single session or uncheck it for multiple sessions.

When Use DDE is selected, the DDE Message should be set to [open("%1")] and Theme to System.

You may also handle (open) the DWG files with "AutoCAD DWG launcher" application (AcLauncher.exe, not AutoCAD itself).

In Windows Vista, actions for the individual file types can be set only in the Registry or using additional tools - like e.g. the applications FileTypes or File Type Doctor.

Important: Please note that in any case, AutoCAD SDI system variable should be set to 0 if you want to open DWGs in a single session (otherwise multiple sessions are used even when DDE is set).

100% Win  CAD 
27.6.2002    26828×   FAQ  
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applies to: AutoCAD · AutoCAD LT ·

See also:
Tip 10377:How to disable the Start tab in AutoCAD 2016?
Tip 8852:Publish interactive 3D models on the web with Autodesk 360.
Tip 8618:Mapping Autodesk Cloud (AutoCAD WS) as a network disk drive.
Tip 7381:How to open another DWG file from LISP?
Tip 6043:The CLOSE command stops to work after loading an add-on application.

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