RtlIntPtrToUnicodeString - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers
#ifndef _NTRTL_H
#ifdef _WIN64

#define RtlIntPtrToUnicodeString(Value, Base, String) RtlInt64ToUnicodeString(Value, Base, String)

#endif
#endif

View code on GitHub
#ifndef _NTRTL_H
#ifdef _WIN64
// ...
#else

#define RtlIntPtrToUnicodeString(Value, Base, String) RtlIntegerToUnicodeString(Value, Base, String)

#endif
#endif

View code on GitHub

This macro is documented in Windows Driver Kit.