<PackageReference Include="NETStandard.Library" Version="2.0.0" />

System.IO.MemoryMappedFiles.MemoryMappedFileAccess

namespace System.IO.MemoryMappedFiles { public enum MemoryMappedFileAccess { CopyOnWrite = 3, Read = 1, ReadExecute = 4, ReadWrite = 0, ReadWriteExecute = 5, Write = 2 } }