The LTEXTENSION structure contains Exif extension information.
String that contains the name of the extension. As Unicode, 2 bytes per character.
Size of the extension data. If the extension data is a stream, this value should be 0xFFFFFFFF.
Pointer to the extension data. If the extension data is a stream, this parameter is NULL.
CLSID that describes the extension data. This is valid only if uDataSize is 0xFFFFFFFF.
Reserved for internal use.
For more information on these structure members and their use, refer to the Exif documentation for the "FlashPix" extensions, inside the APP2 markers.
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