#ifndef _NTRTL_H
NTSYSAPI
PUNICODE_PREFIX_TABLE_ENTRY
NTAPI
RtlFindUnicodePrefix(
_In_ PUNICODE_PREFIX_TABLE PrefixTable,
_In_ PUNICODE_STRING FullName,
_In_ ULONG CaseInsensitiveIndex
);
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This function is documented in Windows Driver Kit.