Where do the attachments go by default when adding attachment files to features in ArcGIS Silverlight viewer??? Is there some table that is created in SDE for such a purpose???
When a file is attached, the attachment is stored in the geodatabase table in ArcSDE (relationship class is created) and no longer has a linkage to the original source file.
When you enable attachments on a feature class, ArcGIS creates a new table to contain the attachment files and a new relationship class to relate the features to the attached files.