RtlIntToUIntPtr - NtDoc

#ifndef _NTINTSAFE_H_INCLUDED_
#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP | WINAPI_PARTITION_SYSTEM | WINAPI_PARTITION_GAMES)
//
// INT -> UINT_PTR conversion
//
#ifdef _WIN64

#define RtlIntToUIntPtr    RtlIntToULongLong

#endif
#endif
#endif
View code on GitHub

#ifndef _NTINTSAFE_H_INCLUDED_
#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP | WINAPI_PARTITION_SYSTEM | WINAPI_PARTITION_GAMES)
//
// INT -> UINT_PTR conversion
//
#ifdef _WIN64
// ...
#else

#define RtlIntToUIntPtr    RtlIntToUInt

#endif
#endif
#endif
View code on GitHub