KEY_VALUE_FULL_INFORMATION - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers
#ifndef _NTREGAPI_H

typedef struct _KEY_VALUE_FULL_INFORMATION
{
    ULONG TitleIndex;
    ULONG Type;
    ULONG DataOffset;
    ULONG DataLength;
    ULONG NameLength;
    _Field_size_bytes_(NameLength) WCHAR Name[1];
    // ...
    // UCHAR Data[1];
} KEY_VALUE_FULL_INFORMATION, *PKEY_VALUE_FULL_INFORMATION;

#endif

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This structure is documented in Windows Driver Kit.