Identifies the format flags such as DETECTSUPPORT, PAGEREADSUPPORT, and other.

Values:

IG_FLTR_DETECTSUPPORT	Format detection is supported.
IG_FLTR_PAGEREADSUPPORT	Page reading is supported.
IG_FLTR_MPAGEREADPSUPPORT	Multi-page reading is supported.
IG_FLTR_MPAGEWRITEPSUPPORT	Multi-page writing is supported.
IG_FLTR_PAGEINSERTSUPPORT	Page insertion is supported.
IG_FLTR_PAGEDELETESUPPORT	Page deleting is supported.
IG_FLTR_PAGESWAPSUPPORT	Page swapping is supported.
IG_FLTR_MPDATASUPPORT	Multi-page data is supported.