IRP flag with value of 0x00060000

Recently, I played with FileSpy in Vista. On write operation
(invoked by just totally usual call of “WriteFile”,
I’ve observed IRP with flags 0x00060A00, which is
IRP_WRITE_OPERATION + IRP_DEFER_IO_COMPLETION + 0x00060000.

Has anyone a clue what does the 0x00060000 flag mean ?

It does not appear in Windows XP after the same operation.
It appears only in Vista, using both FSpy or MSpy filter.
It’s also there regardless of transaction or not.

L.