| Min version | XP | 2003/XP64 SP1 | |
|---|---|---|---|
| Max version | 2003/XP64 SP2 | ||
| Architecture | x86 | x64 | |
| x86 offset offset:bitpos | Field Name | x64 offset offset:bitpos | |
| 0x0000 | struct _HEAP_UCR_SEGMENT * Next | 0x0000 | |
| 0x0004 | uintptr_t ReservedSize | 0x0008 | |
| 0x0008 | uintptr_t CommittedSize | 0x0010 | |
| 0x000C | unsigned long filler | 0x0018 | |