| Min version | Vista | Vista SP1 | |
|---|---|---|---|
| Max version | Vista SP2 | ||
| Architecture | x86 | x64 | |
| x86 offset offset:bitpos | Field Name | x64 offset offset:bitpos | |
| 0x0000 | union _LARGE_INTEGER ReadOffset | 0x0000 | |
| 0x0008 | void * VirtualAddress | 0x0008 | |
| 0x000C | void * FileObject | 0x0010 | |
| 0x0010 | unsigned long ThreadId | 0x0018 | |
| 0x0014 | unsigned long ByteCount | 0x001C | |