2.2.3.4 ImageExtraDataBlock

Specifies the properties of the control that are larger than 4 bytes and are not set to the file format defaults. If the corresponding bit in the PropMask of the ImageControl that contains this ImageExtraDataBlock is set to zero, the property value MUST NOT be stored in the file.


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Size (optional)

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Size (8 bytes): An fmSize that specifies the Size property.