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Thank you for your question.
Please use the API ECompositeViewer.IAdECompositeViewer.SourcePath to set the sourcepath directly instead of OnEndLoadItemEventHandler.
Please refer to the ADR API documentation for more information.
Any further questions please let me know.
-Herbert
Thank you for your question.
Your question seems a DWF publisher issue of Map 3D. I suggest that you can post your question in AutoCAD Map 3D Forum.
Thank you for your supporting Autodesk.
-Herbert