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2.1.7.2 Control Stream (Ctls)

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An instance of the Control Stream specifies the OLE objects and ActiveX controls that use stream-based persistence.

The name of this stream MUST be "Ctls". A file MUST contain at most one Control Stream. An object persisted in this stream MUST have a corresponding Obj record (section 2.4.181) in a worksheet substream (section 2.1.7.20.5) with a cmo.ot field that equals 8 and a pictFlags.fPrstm field that equals 1. The pictFmla.lPosInCtlStm and pictFmla.cbBufInCtlStm fields of the Obj record specify the location of the object data associated with that Obj record.