If you need to identify all DWG drawings containing so called "AEC objects", i.e. objects from the applications AutoCAD Architecture (ADT), AutoCAD Civil 3D or AutoCAD MEP (ABS), you can use the CADstudio DBXscanAEC application.
The free LISP utility DBXscanAEC scans all DWG files in a given folder (and its subfolders) and generates a report with a list of all DWG files containing AEC objects. The files are not opened individually.
If you open such DWG files in AutoCAD, you will need the "Object Enabler" or you will get only proxy entities. This utility can detect such files, so you can resave them properly to a plain DWG format - with the ExportToAutoCAD command.
Just appload this utility and start the "DBXscanAEC" command. Browse to the
folder you want to process and click "Save". It will find DWG files saved from AEC applications.
You can download DBXscanAEC from Download, see the accompanying TXT file.
Sample of a report:
Xanadu DBXscanAEC report (drawings with architectural AEC objects)
------------------------------------------------------------------
Timestamp: 20080418.0923
Start processing root folder C:\Civil 3D Projects\
Start processing folder C:\CIVIL 3D PROJECTS\
-- C:\Civil 3D Projects\BasinAreas.dwg
-- C:\Civil 3D Projects\BIG_LOM.dwg, ***_AEC_objects_***
-- C:\Civil 3D Projects\GPS Data.dwg, ***_AEC_objects_***
---- processing finished ----
More about DBX utilities