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Working with References That Will Be Saved to DWG Files

When you are working with a DGN file that will be saved to a DWG file:

The default Xref Block insert layer for a DGN reference attachment saved in the DWG file is the layer named "0."

To override the default insert layer for reference attachments, set the configuration variable MS_DWGINSERTLAYER to the desired layer name. For example, assigning MS_DWGINSERTLAYER to "MSINSERT" results in the assignment of inserts to the layer "MSINSERT". If this layer does not exist, it will automatically be created.

MS_DWGINSERTLAYER is used to override the default insert layer for normal (unshared) cells as well as reference attachments.