The SYSTEM_REGISTRY_QUOTA_INFORMATION structure is produced as output or expected as input by the functions

respectively, when given the information class SystemRegistryQuotaInformation (0x25).

Documentation Status

The SYSTEM_REGISTRY_QUOTA_INFORMATION structure is defined in WINTERNL.H from the Software Development Kit (SDK). The definition there provides only some of the members: RegistryQuotaAllowed and RegistryQuotaUsed.

Microsoft does publish the practical equivalent of a C-language definition as type information in public symbol files, though not for the kernel, where the structure is prepared, nor even for low-level user-mode DLLs that interpret the structure, but for various higher-level user-mode DLLs such as URLMON.DLL and only then starting with version 6.2.

Two earlier disclosures of type information are known, though not in symbol files but in statically linked libraries: GDISRVL.LIB from the Device Driver Kit (DDK) for Windows NT 3.51; and SHELL32.LIB from the DDK for Windows NT 4.0.


The SYSTEM_REGISTRY_QUOTA_INFORMATION is 0x0C or 0x10 bytes in 32-bit and 64-bit Windows, respectively.

Offset Definition
ULONG RegistryQuotaAllowed;
ULONG RegistryQuotaUsed;
ULONG_PTR PagedPoolSize;