| Value | Meaning |
|---|---|
| Invalid-1 | Init value |
| Byte0 | Signed 8-bit int |
| Char1 | Unsigned 8-bit int |
| Word2 | Signed 16-bit int |
| Short3 | Unsigned 16-bit int |
| DWord4 | Signed 32-bit int |
| Int5 | Unsigned 32-bit int |
| DWord646 | Signed 64-bit int |
| Int647 | Unsigned 64-bit int |
| Float8 | 32-bit float |
| Double9 | 64-bit float |
| String10 | String |
| ResRef11 | String with width <= 16 (32 for NWN2) |
| LocString12 | Localized string |
| Void13 | Binary data |
| Struct14 | Map of other GffField |
| List15 | Array of other GffField |
Type of data owned by a GffField