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. |