C# Definition:

[Flags]
enum CopyFileFlags : uint
{
    COPY_FILE_FAIL_IF_EXISTS          = 0x00000001,
    COPY_FILE_RESTARTABLE         = 0x00000002,
    COPY_FILE_OPEN_SOURCE_FOR_WRITE       = 0x00000004,
    COPY_FILE_ALLOW_DECRYPTED_DESTINATION = 0x00000008,
    COPY_FILE_COPY_SYMLINK        = 0x00000800, //NT 6.0+
    COPY_FILE_NO_BUFFERING        = 0x00001000 //NT 6.0+
}