Character Set Information Extended Attribute は、そのファイル用の文字セットを示します。
Character Set Information Extended Attribute format
| RBP | 大きさ | 型 | 名称 | 内容 |
| 0〜3 | 4 | unsigned long | Attribute Type | =1 |
| 4 | 1 | unsigned char | Attribute Subtype | =1 |
| 5〜7 | 3 | unsigned char[3] | Reserved | =0 |
| 8〜11 | 4 | unsigned long | Attribute Length (=A_L) | 属性長 (4の倍数) [bytes] |
| 12〜15 | 4 | unsigned long | Escape Sequences Length (=ES_L) | Escape Sequencesの長さ [bytes] |
| 16 | 1 | unsigned char | Character Set Type | charspec の Character Set Type と同じ |
| 17〜A_L-1 | ES_L | unsigned char[ES_L] | Escape Sequences | エスケープシーケンス |
