Is a container for PowerPoint specific data of a shape.
The atoms that an msofbtClientData container has are:
An OEShapeAtom if any
An ExObjRefAtom if any
An AnimationInfo atom if any
An InteractiveInfo atom if any ( Instance: MouseClick)
An InteractiveInfo atom if any ( Instance: MouseMove )
A RecolorInfoAtom if any
A ProgTags container for OLE Automation