2.1.2.2.1 Object Stream

Embedded controls that cannot themselves contain other embedded controls are persisted sequentially as FormEmbeddedActiveXControls to a stream contained in the same storage as the parent control. The name of this stream MUST be "o". The order in which they are persisted is specified by the order of SiteData.Sites in the FormControl of the parent, as specified in section 2.2.10.6. If a parent control contains no embedded controls or only embedded controls that are also parent controls, this stream MUST still exist and MUST be empty.