The following complex entities cannot be exploded by explode() or explodeGeometry():
OdDbDgnReference
OdDbDwfReference (*)
OdDbPdfReference
OdDbViewport
(*) For underlay references and OdDbViewport, only the bounding rectangle is produced by explodeGeometry().
Exploding Entities
Simple Entities that Do Not Explode
Complex Entities that Do Explode