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When saving DGN file with an attached ECW raster format to DWG -> error message "This file format is not supported in DWG work mode"
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 (by default C:\Program Files (x86)\Bentley\MicroStation V8i (SELECTseries)\MicroStation\config\system)
_USTN_CAPABILITY_DWG < +CAPABILITY_RASTER_ALL_TYPES
This will allow opening of all supported raster types.
http://communities.bentley.com/products/interoperability/f/157/p/8696/14356#14356