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

System.IO.FileAttributes

public enum FileAttributes
namespace System.IO { public enum FileAttributes { Archive = 32, Compressed = 2048, Device = 64, Directory = 16, Encrypted = 16384, Hidden = 2, IntegrityStream = 32768, Normal = 128, NoScrubData = 131072, NotContentIndexed = 8192, Offline = 4096, ReadOnly = 1, ReparsePoint = 1024, SparseFile = 512, System = 4, Temporary = 256 } }