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The second possible structure for the FILE_OBJECTID_BUFFER data element is as follows.
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ObjectId (16 bytes) |
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ExtendedInfo (48 bytes) |
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ObjectId (16 bytes): A 16-byte GUID that uniquely identifies the file or directory within the volume on which it resides. Specifically, the same object ID can be assigned to another file or directory on a different volume, but it MUST NOT be assigned to another file or directory on the same volume.
ExtendedInfo (48 bytes): A 48-byte value containing extended data that was set with the FSCTL_SET_OBJECT_ID_EXTENDED request. This field contains application-specific data.<7>