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Default raster formats supported by DWG files do not include the ECW format (*before AutoCAD 2012)
If you are aware of this limitation, but still want your raster to export to DWG, edit the following configuration variable in the workmode.cfg file:
_USTN_CAPABILITY_DWG < +CAPABILITY_RASTER_ALL_TYPES
This will allow opening of all supported raster types.
Note:
Georeferenced images are supported just in AutoCAD Map 3D, Civil 3D and Raster Design only.
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