UDF1.02 では、記録しません。
Alternate Permissions Extended Attribute format
| RBP | 大きさ | 型 | 名称 | 内容 |
| 0〜3 | 4 | unsigned long | Attribute Type | =3 |
| 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] |
| 12〜13 | 2 | unsigned short | Owner Identification | 所有者 ID |
| 14〜15 | 2 | unsigned short | Group Identification | グループ ID |
| 16〜17 | 2 | unsigned short | Permission | アクセス許可範囲 (省略) |
