The DVEXTENTINFO structure is used in IViewObjectEx::GetNaturalExtent.
typedef struct tagDVEXTENTINFO
{
ULONG cb;
DWORD dwExtentMode;
SIZEL sizelProposed;
}DVEXTENTINFO;
Windows NT: Use version 4.0 or later. New for OC96.
Windows: Use Windows 95 or later. New for OC96.
Windows CE: Unsupported.
Header: Declared in ocidl.h.