The IFILTER_FLAGS enumeration indicates whether the caller should use the IPropertySetStorage and IPropertyStorage interfaces to locate additional properties.
typedef enum tagIFILTER_FLAGS
{
IFILTER_FLAGS_OLE_PROPERTIES = 1
} IFILTER_FLAGS;
The pdwFlags parameter, in IFilter::Init, allows the IFilter implementation to pass information back to the caller. Currently, the only valid flag is:
If OLE properties should not be enumerated, then pdwFlags should be set to zero.
IFilter::Init, IPropertySetStorage, IPropertyStorage